wp_tactics.v 3.33 KB
Newer Older
1 2 3
From heap_lang Require Export tactics substitution.
Import uPred.

4 5 6 7
Ltac revert_intros tac :=
  lazymatch goal with
  | |-  _, _ => let H := fresh in intro H; revert_intros tac; revert H
  | |- _ => tac
8
  end.
9 10 11 12 13 14 15 16 17
Ltac wp_strip_later :=
  let rec go :=
    lazymatch goal with
    | |- _  (_  _) => apply sep_mono; go
    | |- _   _ => apply later_intro
    | |- _  _ => reflexivity
    end
  in revert_intros ltac:(etransitivity; [|go]).

18 19 20
Ltac wp_bind K :=
  lazymatch eval hnf in K with
  | [] => idtac
21
  | _ => etransitivity; [|solve [ apply (wp_bind K) ]]; simpl
22
  end.
23 24 25 26
Ltac wp_finish :=
  let rec go :=
  match goal with
  | |- _   _ => etransitivity; [|apply later_mono; go; reflexivity]
27 28 29 30 31
  | |- _  wp _ _ _ =>
     etransitivity; [|eapply wp_value; reflexivity];
     (* sometimes, we will have to do a final view shift, so only apply
     wp_value if we obtain a consecutive wp *)
     match goal with |- _  wp _ _ _ => simpl | _ => fail end
32
  | _ => idtac
33
  end in simpl; revert_intros go.
34 35 36

Tactic Notation "wp_value" :=
  match goal with
37
  | |- _  wp ?E ?e ?Q => etransitivity; [|eapply wp_value; reflexivity]; simpl
38
  end.
39

40
Tactic Notation "wp_rec" ">" :=
41 42 43
  match goal with
  | |- _  wp ?E ?e ?Q => reshape_expr e ltac:(fun K e' =>
    match eval cbv in e' with
44 45
    | App (Rec _ _ _) _ =>
       wp_bind K; etransitivity; [|eapply wp_rec; reflexivity]; wp_finish
46 47
    end)
  end.
48
Tactic Notation "wp_rec" := wp_rec>; wp_strip_later.
49

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
Tactic Notation "wp_lam" ">" :=
  match goal with
  | |- _  wp ?E ?e ?Q => reshape_expr e ltac:(fun K e' =>
    match eval cbv in e' with
    | App (Rec "" _ _) _ =>
       wp_bind K; etransitivity; [|eapply wp_lam; reflexivity]; wp_finish
    end)
  end.
Tactic Notation "wp_lam" := wp_lam>; wp_strip_later.

Tactic Notation "wp_let" ">" := wp_lam>.
Tactic Notation "wp_let" := wp_lam.
Tactic Notation "wp_seq" ">" := wp_let>.
Tactic Notation "wp_seq" := wp_let.

65
Tactic Notation "wp_op" ">" :=
66 67 68
  match goal with
  | |- _  wp ?E ?e ?Q => reshape_expr e ltac:(fun K e' =>
    match eval cbv in e' with
69 70 71 72 73 74 75
    | BinOp LtOp _ _ => wp_bind K; apply wp_lt; wp_finish
    | BinOp LeOp _ _ => wp_bind K; apply wp_le; wp_finish
    | BinOp EqOp _ _ => wp_bind K; apply wp_eq; wp_finish
    | BinOp _ _ _ =>
       wp_bind K; etransitivity; [|eapply wp_bin_op; reflexivity]; wp_finish
    | UnOp _ _ =>
       wp_bind K; etransitivity; [|eapply wp_un_op; reflexivity]; wp_finish
76 77
    end)
  end.
78 79
Tactic Notation "wp_op" := wp_op>; wp_strip_later.

80
Tactic Notation "wp_if" ">" :=
81 82 83 84
  match goal with
  | |- _  wp ?E ?e ?Q => reshape_expr e ltac:(fun K e' =>
    match eval cbv in e' with
    | If _ _ _ =>
85 86
       wp_bind K;
       etransitivity; [|apply wp_if_true || apply wp_if_false]; wp_finish
87 88
    end)
  end.
89
Tactic Notation "wp_if" := wp_if>; wp_strip_later.
90

91 92 93 94 95
Tactic Notation "wp_focus" open_constr(efoc) :=
  match goal with
  | |- _  wp ?E ?e ?Q => reshape_expr e ltac:(fun K e' =>
    match e' with efoc => unify e' efoc; wp_bind K end)
  end.
96

97
Tactic Notation "wp" ">" tactic(tac) :=
98 99 100
  match goal with
  | |- _  wp ?E ?e ?Q => reshape_expr e ltac:(fun K e' => wp_bind K; tac)
  end.
101
Tactic Notation "wp" tactic(tac) := (wp> tac); wp_strip_later.
102 103 104 105

(* In case the precondition does not match *)
Tactic Notation "ewp" tactic(tac) := wp (etransitivity; [|tac]).
Tactic Notation "ewp" ">" tactic(tac) := wp> (etransitivity; [|tac]).