### World satisfaction.

parent 386b91b5
iris/wsat.v 0 → 100644
 Require Export iris.model prelude.co_pset. Local Hint Extern 10 (✓{_} _) => solve_validN. Local Hint Extern 1 (✓{_} (gst _)) => apply gst_validN. Local Hint Extern 1 (✓{_} (wld _)) => apply wld_validN. Record wsat_pre {Σ} (n : nat) (E : coPset) (σ : istate Σ) (rs : gmap positive (res' Σ)) (r : res' Σ) := { wsat_pre_valid : ✓{S n} r; wsat_pre_state : pst r ≡ Excl σ; wsat_pre_dom i : is_Some (rs !! i) → i ∈ E ∧ is_Some (wld r !! i); wsat_pre_wld i P : i ∈ E → wld r !! i ={S n}= Some (to_agree (Later (iProp_unfold P))) → ∃ r', rs !! i = Some r' ∧ P n r' }. Arguments wsat_pre_valid {_ _ _ _ _ _} _. Arguments wsat_pre_state {_ _ _ _ _ _} _. Arguments wsat_pre_dom {_ _ _ _ _ _} _ _ _. Arguments wsat_pre_wld {_ _ _ _ _ _} _ _ _ _ _. Definition wsat {Σ} (n : nat) (E : coPset) (σ : istate Σ) (r : res' Σ) : Prop := match n with 0 => True | S n => ∃ rs, wsat_pre n E σ rs (r ⋅ big_opM rs) end. Instance: Params (@wsat) 4. Section wsat. Context {Σ : iParam}. Implicit Types σ : istate Σ. Implicit Types r : res' Σ. Implicit Types rs : gmap positive (res' Σ). Implicit Types P : iProp Σ. Instance wsat_ne' : Proper (dist n ==> impl) (wsat (Σ:=Σ) n E σ). Proof. intros [|n] E σ r1 r2 Hr; first done; intros [rs [Hdom Hv Hs Hinv]]. exists rs; constructor; intros until 0; setoid_rewrite <-Hr; eauto. Qed. Global Instance wsat_ne n : Proper (dist n ==> iff) (wsat (Σ:=Σ) n E σ) | 1. Proof. by intros E σ w1 w2 Hw; split; apply wsat_ne'. Qed. Global Instance wsat_proper n : Proper ((≡) ==> iff) (wsat (Σ:=Σ) n E σ) | 1. Proof. by intros E σ w1 w2 Hw; apply wsat_ne, equiv_dist. Qed. Lemma wsat_valid n E σ (r : res' Σ) : wsat n E σ r → ✓{n} r. Proof. destruct n; [intros; apply cmra_valid_0|intros [rs ?]]. eapply cmra_valid_op_l, wsat_pre_valid; eauto. Qed. Lemma wsat_open n E σ r i P : wld r !! i ={S n}= Some (to_agree (Later (iProp_unfold P))) → i ∉ E → wsat (S n) ({[i]} ∪ E) σ r → ∃ rP, wsat (S n) E σ (rP ⋅ r) ∧ P n rP. Proof. intros HiP Hi [rs [Hval Hσ HE Hwld]]. destruct (Hwld i P) as (rP&?&?); [solve_elem_of +|by apply lookup_wld_op_l|]. assert (rP ⋅ r ⋅ big_opM (delete i rs) ≡ r ⋅ big_opM rs) as Hr. { by rewrite (commutative _ rP) -(associative _) big_opM_delete. } exists rP; split; [exists (delete i rs); constructor; rewrite ?Hr|]; auto. * intros j; rewrite lookup_delete_is_Some Hr. generalize (HE j); solve_elem_of +Hi. * intros j P'; rewrite Hr=> Hj ?. setoid_rewrite lookup_delete_ne; last (solve_elem_of +Hi Hj). apply Hwld; [solve_elem_of +Hj|done]. Qed. Lemma wsat_close n E σ r i P rP : wld rP !! i ={S n}= Some (to_agree (Later (iProp_unfold P))) → i ∉ E → wsat (S n) E σ (rP ⋅ r) → P n rP → wsat (S n) ({[i]} ∪ E) σ r. Proof. intros HiP HiE [rs [Hval Hσ HE Hwld]] ?. assert (rs !! i = None) by (apply eq_None_not_Some; naive_solver). assert (r ⋅ big_opM (<[i:=rP]> rs) ≡ rP ⋅ r ⋅ big_opM rs) as Hr. { by rewrite (commutative _ rP) -(associative _) big_opM_insert. } exists (<[i:=rP]>rs); constructor; rewrite ?Hr; auto. * intros j; rewrite Hr lookup_insert_is_Some=>-[?|[??]]; subst. + rewrite !lookup_op HiP !op_is_Some; solve_elem_of -. + destruct (HE j) as [Hj Hj']; auto; solve_elem_of +Hj Hj'. * intros j P'; rewrite Hr elem_of_union elem_of_singleton=>-[?|?]; subst. + rewrite !lookup_wld_op_l ?HiP; auto=> HP. apply (injective Some), (injective to_agree), (injective Later), (injective iProp_unfold) in HP. exists rP; split; [rewrite lookup_insert|apply HP]; auto. + intros. destruct (Hwld j P') as (r'&?&?); auto. exists r'; rewrite lookup_insert_ne; naive_solver. Qed. Lemma wsat_update_pst n E σ1 σ2 r : pst r ={S n}= Excl σ1 → wsat (S n) E σ1 r → wsat (S n) E σ2 (update_pst σ2 r). Proof. intros Hr [rs [(?&Hpst&?) Hσ HE Hwld]]; simpl in *. assert (pst (big_opM rs) = ∅) as Hpst_rs. { by apply: (excl_validN_inv_l n σ1); rewrite -Hr. } by exists rs; constructor; split_ands'; rewrite /= ?Hpst_rs. Qed. Lemma wsat_update_gst n E σ r rf m1 (P : icmra' Σ → Prop) : m1 ≼{S n} gst r → m1 ⇝: P → wsat (S n) E σ (r ⋅ rf) → ∃ m2, wsat (S n) E σ (update_gst m2 r ⋅ rf) ∧ P m2. Proof. intros [mf Hr] Hup [rs [(?&?&?) Hσ HE Hwld]]. destruct (Hup (mf ⋅ gst (rf ⋅ big_opM rs)) (S n)) as (m2&?&Hval'). { by rewrite /= (associative _ m1) -Hr (associative _). } exists m2; split; [exists rs; split; split_ands'; auto|done]. Qed. Lemma wsat_alloc n E1 E2 σ r P rP : ¬set_finite E1 → P n rP → wsat (S n) (E1 ∪ E2) σ (rP ⋅ r) → ∃ i, wsat (S n) (E1 ∪ E2) σ (Res {[i ↦ to_agree (Later (iProp_unfold P))]} ∅ ∅ ⋅ r) ∧ wld r !! i = None ∧ i ∈ E1. Proof. intros HE1 ? [rs [Hval Hσ HE Hwld]]. assert (∃ i, i ∈ E1 ∧ wld r !! i = None ∧ wld rP !! i = None ∧ wld (big_opM rs) !! i = None) as (i&Hi&Hri&HrPi&Hrsi). { exists (coPpick (E1 ∖ (dom _ (wld r) ∪ (dom _ (wld rP) ∪ dom _ (wld (big_opM rs)))))). rewrite -!not_elem_of_dom -?not_elem_of_union -elem_of_difference. apply coPpick_elem_of=>HE'; eapply HE1, (difference_finite_inv _ _), HE'. by repeat apply union_finite; apply dom_finite. } assert (rs !! i = None). { apply eq_None_not_Some=>?; destruct (HE i) as [_ Hri']; auto; revert Hri'. rewrite /= !lookup_op !op_is_Some -!not_eq_None_Some; tauto. } assert (r ⋅ big_opM (<[i:=rP]> rs) ≡ rP ⋅ r ⋅ big_opM rs) as Hr. { by rewrite (commutative _ rP) -(associative _) big_opM_insert. } exists i; split_ands; [exists (<[i:=rP]>rs); constructor| |]; auto. * destruct Hval as (?&?&?); rewrite -(associative _) Hr. split_ands'; rewrite /= ?(left_id _ _); [|eauto|eauto]. intros j; destruct (decide (j = i)) as [->|]. + by rewrite !lookup_op Hri HrPi Hrsi !(right_id _ _) lookup_singleton. + by rewrite lookup_op lookup_singleton_ne // (left_id _ _). * by rewrite -(associative _) Hr /= (left_id _ _). * intros j; rewrite -(associative _) Hr; destruct (decide (j = i)) as [->|]. + rewrite /= !lookup_op lookup_singleton !op_is_Some; solve_elem_of +Hi. + rewrite lookup_insert_ne //. rewrite lookup_op lookup_singleton_ne // (left_id _ _); eauto. * intros j P'; rewrite -(associative _) Hr; destruct (decide (j=i)) as [->|]. + rewrite /= !lookup_op Hri HrPi Hrsi (right_id _ _) lookup_singleton=>? HP. apply (injective Some), (injective to_agree), (injective Later), (injective iProp_unfold) in HP. exists rP; rewrite lookup_insert; split; [|apply HP]; auto. + rewrite /= lookup_op lookup_singleton_ne // (left_id _ _)=> ??. destruct (Hwld j P') as [r' ?]; auto. by exists r'; rewrite lookup_insert_ne. Qed. End wsat.
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