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From algebra Require Export sts.
From program_logic Require Export invariants ghost_ownership.
Import uPred.

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Class stsG Λ Σ (sts : stsT) := StsG {
  sts_inG :> inG Λ Σ (stsRA sts);
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  sts_inhabited :> Inhabited (sts.state sts);
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}.
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Coercion sts_inG : stsG >-> inG.
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Section definitions.
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  Context `{i : stsG Λ Σ sts} (γ : gname).
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  Import sts.
  Definition sts_inv (φ : state sts  iPropG Λ Σ) : iPropG Λ Σ :=
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    ( s, own γ (sts_auth s )  φ s)%I.
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  Definition sts_ownS (S : states sts) (T : tokens sts) : iPropG Λ Σ:=
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    own γ (sts_frag S T).
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  Definition sts_own (s : state sts) (T : tokens sts) : iPropG Λ Σ :=
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    own γ (sts_frag_up s T).
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  Definition sts_ctx (N : namespace) (φ: state sts  iPropG Λ Σ) : iPropG Λ Σ :=
    inv N (sts_inv φ).
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End definitions.
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Instance: Params (@sts_inv) 5.
Instance: Params (@sts_ownS) 5.
Instance: Params (@sts_own) 6.
Instance: Params (@sts_ctx) 6.
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Section sts.
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  Context `{stsG Λ Σ sts} (φ : sts.state sts  iPropG Λ Σ).
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  Implicit Types N : namespace.
  Implicit Types P Q R : iPropG Λ Σ.
  Implicit Types γ : gname.
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  Implicit Types S : sts.states sts.
  Implicit Types T : sts.tokens sts.

  (** Setoids *)
  Global Instance sts_inv_ne n γ :
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    Proper (pointwise_relation _ (dist n) ==> dist n) (sts_inv γ).
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  Proof. by intros φ1 φ2 Hφ; rewrite /sts_inv; setoid_rewrite Hφ. Qed.
  Global Instance sts_inv_proper γ :
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    Proper (pointwise_relation _ () ==> ()) (sts_inv γ).
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  Proof. by intros φ1 φ2 Hφ; rewrite /sts_inv; setoid_rewrite Hφ. Qed.
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  Global Instance sts_ownS_proper γ : Proper (() ==> () ==> ()) (sts_ownS γ).
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  Proof. intros S1 S2 HS T1 T2 HT. by rewrite /sts_ownS HS HT. Qed.
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  Global Instance sts_own_proper γ s : Proper (() ==> ()) (sts_ownS γ s).
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  Proof. intros T1 T2 HT. by rewrite /sts_ownS HT. Qed.
  Global Instance sts_ctx_ne n γ N :
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    Proper (pointwise_relation _ (dist n) ==> dist n) (sts_ctx γ N).
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  Proof. by intros φ1 φ2 Hφ; rewrite /sts_ctx Hφ. Qed.
  Global Instance sts_ctx_proper γ N :
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    Proper (pointwise_relation _ () ==> ()) (sts_ctx γ N).
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  Proof. by intros φ1 φ2 Hφ; rewrite /sts_ctx Hφ. Qed.
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  (* The same rule as implication does *not* hold, as could be shown using
     sts_frag_included. *)
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  Lemma sts_ownS_weaken E γ S1 S2 T :
    S1  S2  sts.closed S2 T 
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    sts_ownS γ S1 T  pvs E E (sts_ownS γ S2 T).
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  Proof. intros. by apply own_update, sts_update_frag. Qed.
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  Lemma sts_own_weaken E γ s S T :
    s  S  sts.closed S T 
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    sts_own γ s T  pvs E E (sts_ownS γ S T).
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  Proof. intros. by apply own_update, sts_update_frag_up. Qed.
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  Lemma sts_alloc N s :
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    φ s  pvs N N ( γ, sts_ctx γ N φ  sts_own γ s (  sts.tok s)).
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  Proof.
    eapply sep_elim_True_r.
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    { apply (own_alloc (sts_auth s (  sts.tok s)) N).
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      apply sts_auth_valid; solve_elem_of. }
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    rewrite pvs_frame_l. apply pvs_strip_pvs.
    rewrite sep_exist_l. apply exist_elim=>γ. rewrite -(exist_intro γ).
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    transitivity ( sts_inv γ φ  sts_own γ s (  sts.tok s))%I.
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    { rewrite /sts_inv -later_intro -(exist_intro s).
      rewrite [(_  φ _)%I]comm -assoc. apply sep_mono_r.
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      by rewrite -own_op sts_op_auth_frag_up; last solve_elem_of. }
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    rewrite (inv_alloc N) /sts_ctx pvs_frame_r.
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    by rewrite always_and_sep_l.
  Qed.

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  Lemma sts_opened E γ S T :
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    ( sts_inv γ φ  sts_ownS γ S T)
     pvs E E ( s,  (s  S)   φ s  own γ (sts_auth s T)).
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  Proof.
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    rewrite /sts_inv /sts_ownS later_exist sep_exist_r. apply exist_elim=>s.
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    rewrite later_sep pvs_timeless !pvs_frame_r. apply pvs_mono.
    rewrite -(exist_intro s).
    rewrite [(_  ▷φ _)%I]comm -!assoc -own_op -[(▷φ _  _)%I]comm.
    rewrite own_valid_l discrete_validI.
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    rewrite -!assoc. apply const_elim_sep_l=> Hvalid.
    assert (s  S) by (by eapply sts_auth_frag_valid_inv, discrete_valid).
    rewrite const_equiv // left_id comm sts_op_auth_frag //.
    (* this is horrible, but will be fixed whenever we have RAs back *)
    by rewrite -sts_frag_valid; eapply cmra_valid_op_r, discrete_valid.
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  Qed.

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  Lemma sts_closing E γ s T s' T' :
    sts.step (s, T) (s', T') 
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    ( φ s'  own γ (sts_auth s T))  pvs E E ( sts_inv γ φ  sts_own γ s' T').
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  Proof.
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    intros Hstep. rewrite /sts_inv /sts_own -(exist_intro s').
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    rewrite later_sep [(_  ▷φ _)%I]comm -assoc.
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    rewrite -pvs_frame_l. apply sep_mono_r. rewrite -later_intro.
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    rewrite own_valid_l discrete_validI. apply const_elim_sep_l=>Hval.
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    transitivity (pvs E E (own γ (sts_auth s' T'))).
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    { by apply own_update, sts_update_auth. }
    by rewrite -own_op sts_op_auth_frag_up; last by inversion_clear Hstep.
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  Qed.
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  Context {V} (fsa : FSA Λ (globalF Σ) V) `{!FrameShiftAssertion fsaV fsa}.

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  Lemma sts_fsaS E N P (Q : V  iPropG Λ Σ) γ S T :
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    fsaV  nclose N  E 
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    P  sts_ctx γ N φ 
    P  (sts_ownS γ S T   s,
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           (s  S)   φ s -
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          fsa (E  nclose N) (λ x,  s' T',
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             sts.step (s, T) (s', T')   φ s' 
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            (sts_own γ s' T' - Q x))) 
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    P  fsa E Q.
  Proof.
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    rewrite /sts_ctx=>? HN Hinv Hinner.
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    eapply (inv_fsa fsa); eauto. rewrite Hinner=>{Hinner Hinv P HN}.
    apply wand_intro_l. rewrite assoc.
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    rewrite (sts_opened (E  N)) !pvs_frame_r !sep_exist_r.
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    apply (fsa_strip_pvs fsa). apply exist_elim=>s.
    rewrite (forall_elim s). rewrite [(_  _)%I]comm.
    (* Getting this wand eliminated is really annoying. *)
    rewrite [(_  _)%I]comm -!assoc [(▷φ _  _  _)%I]assoc [(▷φ _  _)%I]comm.
    rewrite wand_elim_r fsa_frame_l.
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    apply (fsa_mono_pvs fsa)=> x.
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    rewrite sep_exist_l; apply exist_elim=> s'.
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    rewrite sep_exist_l; apply exist_elim=>T'.
    rewrite comm -!assoc. apply const_elim_sep_l=>-Hstep.
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    rewrite assoc [(_  (_ - _))%I]comm -assoc.
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    rewrite (sts_closing (E  N)) //; [].
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    rewrite pvs_frame_l. apply pvs_mono.
    by rewrite assoc [(_  _)%I]comm -assoc wand_elim_l.
  Qed.

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  Lemma sts_fsa E N P (Q : V  iPropG Λ Σ) γ s0 T :
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    fsaV  nclose N  E 
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    P  sts_ctx γ N φ 
    P  (sts_own γ s0 T   s,
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           (s  sts.up s0 T)   φ s -
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          fsa (E  nclose N) (λ x,  s' T',
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             (sts.step (s, T) (s', T'))   φ s' 
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            (sts_own γ s' T' - Q x))) 
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    P  fsa E Q.
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  Proof. apply sts_fsaS. Qed.
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End sts.