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From iris.base_logic Require Export gen_heap.
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From iris.program_logic Require Export weakestpre.
From iris.program_logic Require Import ectx_lifting total_ectx_lifting.
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From iris.heap_lang Require Export lang.
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From iris.heap_lang Require Import tactics.
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From iris.proofmode Require Import tactics.
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From stdpp Require Import fin_maps.
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Set Default Proof Using "Type".
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Class heapG Σ := HeapG {
  heapG_invG : invG Σ;
  heapG_gen_heapG :> gen_heapG loc val Σ
}.

Instance heapG_irisG `{heapG Σ} : irisG heap_lang Σ := {
  iris_invG := heapG_invG;
  state_interp := gen_heap_ctx
}.
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Global Opaque iris_invG.
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(** Override the notations so that scopes and coercions work out *)
Notation "l ↦{ q } v" := (mapsto (L:=loc) (V:=val) l q v%V)
  (at level 20, q at level 50, format "l  ↦{ q }  v") : uPred_scope.
Notation "l ↦ v" :=
  (mapsto (L:=loc) (V:=val) l 1 v%V) (at level 20) : uPred_scope.
Notation "l ↦{ q } -" := ( v, l {q} v)%I
  (at level 20, q at level 50, format "l  ↦{ q }  -") : uPred_scope.
Notation "l ↦ -" := (l {1} -)%I (at level 20) : uPred_scope.

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(** The tactic [inv_head_step] performs inversion on hypotheses of the shape
[head_step]. The tactic will discharge head-reductions starting from values, and
simplifies hypothesis related to conversions from and to values, and finite map
operations. This tactic is slightly ad-hoc and tuned for proving our lifting
lemmas. *)
Ltac inv_head_step :=
  repeat match goal with
  | _ => progress simplify_map_eq/= (* simplify memory stuff *)
  | H : to_val _ = Some _ |- _ => apply of_to_val in H
  | H : head_step ?e _ _ _ _ |- _ =>
     try (is_var e; fail 1); (* inversion yields many goals if [e] is a variable
     and can thus better be avoided. *)
     inversion H; subst; clear H
  end.

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Local Hint Extern 0 (atomic _ _) => solve_atomic.
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Local Hint Extern 0 (head_reducible _ _) => eexists _, _, _; simpl.

Local Hint Constructors head_step.
Local Hint Resolve alloc_fresh.
Local Hint Resolve to_of_val.
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Local Ltac solve_exec_safe := intros; subst; do 3 eexists; econstructor; eauto.
Local Ltac solve_exec_puredet := simpl; intros; by inv_head_step.
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Local Ltac solve_pure_exec :=
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  unfold IntoVal, AsVal in *; subst;
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  repeat match goal with H : is_Some _ |- _ => destruct H as [??] end;
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  apply det_head_step_pure_exec; [ solve_exec_safe | solve_exec_puredet ].
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Class AsRec (e : expr) (f x : binder) (erec : expr) :=
  as_rec : e = Rec f x erec.
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Instance AsRec_rec f x e : AsRec (Rec f x e) f x e := eq_refl.
Instance AsRec_rec_locked_val v f x e :
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  AsRec (of_val v) f x e  AsRec (of_val (locked v)) f x e.
Proof. by unlock. Qed.

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Instance pure_rec f x (erec e1 e2 : expr)
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    `{!AsVal e2, AsRec e1 f x erec, Closed (f :b: x :b: []) erec} :
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  PureExec True (App e1 e2) (subst' x e2 (subst' f e1 erec)).
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Proof. unfold AsRec in *; solve_pure_exec. Qed.
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Instance pure_unop op e v v' `{!IntoVal e v} :
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  PureExec (un_op_eval op v = Some v') (UnOp op e) (of_val v').
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Proof. solve_pure_exec. Qed.
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Instance pure_binop op e1 e2 v1 v2 v' `{!IntoVal e1 v1, !IntoVal e2 v2} :
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  PureExec (bin_op_eval op v1 v2 = Some v') (BinOp op e1 e2) (of_val v').
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Proof. solve_pure_exec. Qed.
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Instance pure_if_true e1 e2 : PureExec True (If (Lit (LitBool true)) e1 e2) e1.
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Proof. solve_pure_exec. Qed.
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Instance pure_if_false e1 e2 : PureExec True (If (Lit (LitBool false)) e1 e2) e2.
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Proof. solve_pure_exec. Qed.
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Instance pure_fst e1 e2 v1 `{!IntoVal e1 v1, !AsVal e2} :
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  PureExec True (Fst (Pair e1 e2)) e1.
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Proof. solve_pure_exec. Qed.
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Instance pure_snd e1 e2 v2 `{!AsVal e1, !IntoVal e2 v2} :
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  PureExec True (Snd (Pair e1 e2)) e2.
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Proof. solve_pure_exec. Qed.
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Instance pure_case_inl e0 v e1 e2 `{!IntoVal e0 v} :
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  PureExec True (Case (InjL e0) e1 e2) (App e1 e0).
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Proof. solve_pure_exec. Qed.
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Instance pure_case_inr e0 v e1 e2 `{!IntoVal e0 v} :
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  PureExec True (Case (InjR e0) e1 e2) (App e2 e0).
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Proof. solve_pure_exec. Qed.
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Section lifting.
Context `{heapG Σ}.
Implicit Types P Q : iProp Σ.
Implicit Types Φ : val  iProp Σ.
Implicit Types efs : list expr.
Implicit Types σ : state.

(** Base axioms for core primitives of the language: Stateless reductions *)
Lemma wp_fork s E e Φ :
   Φ (LitV LitUnit)   WP e @ s;  {{ _, True }}  WP Fork e @ s; E {{ Φ }}.
Proof.
  iIntros "[HΦ He]".
  iApply wp_lift_pure_det_head_step; [auto|intros; inv_head_step; eauto|].
  iModIntro; iNext; iIntros "!> /= {$He}". by iApply wp_value.
Qed.
Lemma twp_fork s E e Φ :
  Φ (LitV LitUnit)  WP e @ s;  [{ _, True }]  WP Fork e @ s; E [{ Φ }].
Proof.
  iIntros "[HΦ He]".
  iApply twp_lift_pure_det_head_step; [auto|intros; inv_head_step; eauto|].
  iIntros "!> /= {$He}". by iApply twp_value.
Qed.

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(** Heap *)
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Lemma wp_alloc s E e v :
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  IntoVal e v 
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  {{{ True }}} Alloc e @ s; E {{{ l, RET LitV (LitLoc l); l  v }}}.
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Proof.
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  iIntros (<-%of_to_val Φ) "_ HΦ". iApply wp_lift_atomic_head_step_no_fork; auto.
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  iIntros (σ1) "Hσ !>"; iSplit; first by auto.
  iNext; iIntros (v2 σ2 efs Hstep); inv_head_step.
  iMod (@gen_heap_alloc with "Hσ") as "[Hσ Hl]"; first done.
  iModIntro; iSplit=> //. iFrame. by iApply "HΦ".
Qed.
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Lemma twp_alloc s E e v :
  IntoVal e v 
  [[{ True }]] Alloc e @ s; E [[{ l, RET LitV (LitLoc l); l  v }]].
Proof.
  iIntros (<-%of_to_val Φ) "_ HΦ". iApply twp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>"; iSplit; first by auto.
  iIntros (v2 σ2 efs Hstep); inv_head_step.
  iMod (@gen_heap_alloc with "Hσ") as "[Hσ Hl]"; first done.
  iModIntro; iSplit=> //. iFrame. by iApply "HΦ".
Qed.
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Lemma wp_load s E l q v :
  {{{  l {q} v }}} Load (Lit (LitLoc l)) @ s; E {{{ RET v; l {q} v }}}.
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Proof.
  iIntros (Φ) ">Hl HΦ". iApply wp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto.
  iNext; iIntros (v2 σ2 efs Hstep); inv_head_step.
  iModIntro; iSplit=> //. iFrame. by iApply "HΦ".
Qed.
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Lemma twp_load s E l q v :
  [[{ l {q} v }]] Load (Lit (LitLoc l)) @ s; E [[{ RET v; l {q} v }]].
Proof.
  iIntros (Φ) "Hl HΦ". iApply twp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto.
  iIntros (v2 σ2 efs Hstep); inv_head_step.
  iModIntro; iSplit=> //. iFrame. by iApply "HΦ".
Qed.
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Lemma wp_store s E l v' e v :
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  IntoVal e v 
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  {{{  l  v' }}} Store (Lit (LitLoc l)) e @ s; E {{{ RET LitV LitUnit; l  v }}}.
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Proof.
  iIntros (<-%of_to_val Φ) ">Hl HΦ".
  iApply wp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto. iNext; iIntros (v2 σ2 efs Hstep); inv_head_step.
  iMod (@gen_heap_update with "Hσ Hl") as "[$ Hl]".
  iModIntro. iSplit=>//. by iApply "HΦ".
Qed.
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Lemma twp_store s E l v' e v :
  IntoVal e v 
  [[{ l  v' }]] Store (Lit (LitLoc l)) e @ s; E [[{ RET LitV LitUnit; l  v }]].
Proof.
  iIntros (<-%of_to_val Φ) "Hl HΦ".
  iApply twp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto. iIntros (v2 σ2 efs Hstep); inv_head_step.
  iMod (@gen_heap_update with "Hσ Hl") as "[$ Hl]".
  iModIntro. iSplit=>//. by iApply "HΦ".
Qed.
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Lemma wp_cas_fail s E l q v' e1 v1 e2 :
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  IntoVal e1 v1  AsVal e2  v'  v1 
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  {{{  l {q} v' }}} CAS (Lit (LitLoc l)) e1 e2 @ s; E
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  {{{ RET LitV (LitBool false); l {q} v' }}}.
Proof.
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  iIntros (<-%of_to_val [v2 <-%of_to_val] ? Φ) ">Hl HΦ".
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  iApply wp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto. iNext; iIntros (v2' σ2 efs Hstep); inv_head_step.
  iModIntro; iSplit=> //. iFrame. by iApply "HΦ".
Qed.
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Lemma twp_cas_fail s E l q v' e1 v1 e2 :
  IntoVal e1 v1  AsVal e2  v'  v1 
  [[{ l {q} v' }]] CAS (Lit (LitLoc l)) e1 e2 @ s; E
  [[{ RET LitV (LitBool false); l {q} v' }]].
Proof.
  iIntros (<-%of_to_val [v2 <-%of_to_val] ? Φ) "Hl HΦ".
  iApply twp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto. iIntros (v2' σ2 efs Hstep); inv_head_step.
  iModIntro; iSplit=> //. iFrame. by iApply "HΦ".
Qed.
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Lemma wp_cas_suc s E l e1 v1 e2 v2 :
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  IntoVal e1 v1  IntoVal e2 v2 
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  {{{  l  v1 }}} CAS (Lit (LitLoc l)) e1 e2 @ s; E
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  {{{ RET LitV (LitBool true); l  v2 }}}.
Proof.
  iIntros (<-%of_to_val <-%of_to_val Φ) ">Hl HΦ".
  iApply wp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto. iNext; iIntros (v2' σ2 efs Hstep); inv_head_step.
  iMod (@gen_heap_update with "Hσ Hl") as "[$ Hl]".
  iModIntro. iSplit=>//. by iApply "HΦ".
Qed.
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Lemma twp_cas_suc s E l e1 v1 e2 v2 :
  IntoVal e1 v1  IntoVal e2 v2 
  [[{ l  v1 }]] CAS (Lit (LitLoc l)) e1 e2 @ s; E
  [[{ RET LitV (LitBool true); l  v2 }]].
Proof.
  iIntros (<-%of_to_val <-%of_to_val Φ) "Hl HΦ".
  iApply twp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto. iIntros (v2' σ2 efs Hstep); inv_head_step.
  iMod (@gen_heap_update with "Hσ Hl") as "[$ Hl]".
  iModIntro. iSplit=>//. by iApply "HΦ".
Qed.
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Lemma wp_faa s E l i1 e2 i2 :
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  IntoVal e2 (LitV (LitInt i2)) 
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  {{{  l  LitV (LitInt i1) }}} FAA (Lit (LitLoc l)) e2 @ s; E
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  {{{ RET LitV (LitInt i1); l  LitV (LitInt (i1 + i2)) }}}.
Proof.
  iIntros (<-%of_to_val Φ) ">Hl HΦ".
  iApply wp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto. iNext; iIntros (v2' σ2 efs Hstep); inv_head_step.
  iMod (@gen_heap_update with "Hσ Hl") as "[$ Hl]".
  iModIntro. iSplit=>//. by iApply "HΦ".
Qed.
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Lemma twp_faa s E l i1 e2 i2 :
  IntoVal e2 (LitV (LitInt i2)) 
  [[{ l  LitV (LitInt i1) }]] FAA (Lit (LitLoc l)) e2 @ s; E
  [[{ RET LitV (LitInt i1); l  LitV (LitInt (i1 + i2)) }]].
Proof.
  iIntros (<-%of_to_val Φ) "Hl HΦ".
  iApply twp_lift_atomic_head_step_no_fork; auto.
  iIntros (σ1) "Hσ !>". iDestruct (@gen_heap_valid with "Hσ Hl") as %?.
  iSplit; first by eauto. iIntros (v2' σ2 efs Hstep); inv_head_step.
  iMod (@gen_heap_update with "Hσ Hl") as "[$ Hl]".
  iModIntro. iSplit=>//. by iApply "HΦ".
Qed.
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End lifting.