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Commit b0e4b6fa authored by Robbert Krebbers's avatar Robbert Krebbers
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Merge branch 'robbert/fupd_new_axioms' into 'master' 

More principled set of axioms for fancy updates and plainly

Closes #164

See merge request FP/iris-coq!184
parents 3c5086b2 5d3c508d
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theories/base_logic/lib/fancy_updates.v
View file @ b0e4b6fa
......@@ -41,17 +41,26 @@ Proof. rewrite /BiBUpdFUpd uPred_fupd_eq. by iIntros (E P) ">? [$ $] !> !>". Qed
Instance uPred_bi_fupd_plainly `{invG Σ} : BiFUpdPlainly (uPredSI (iResUR Σ)).
Proof.
split.
- rewrite uPred_fupd_eq /uPred_fupd_def. iIntros (E P Q) "HQP HQ [Hw HE]".
iAssert (◇ ■ P)%I as "#>HP'".
{ by iMod ("HQP" with "HQ [$]") as "(_ & _ & HP)". }
- rewrite uPred_fupd_eq /uPred_fupd_def. iIntros (E P) "H [Hw HE]".
iAssert (◇ ■ P)%I as "#>HP".
{ by iMod ("H" with "[$]") as "(_ & _ & HP)". }
by iFrame.
- rewrite uPred_fupd_eq /uPred_fupd_def. iIntros (E P Q) "[H HQ] [Hw HE]".
iAssert (◇ ■ P)%I as "#>HP".
{ by iMod ("H" with "HQ [$]") as "(_ & _ & HP)". }
by iFrame.
- rewrite uPred_fupd_eq /uPred_fupd_def. iIntros (E P) "H [Hw HE]".
iAssert (▷ ◇ ■ P)%I as "#HP".
{ iNext. by iMod ("H" with "[$]") as "(_ & _ & HP)". }
iFrame. iIntros "!> !> !>". by iMod "HP".
- rewrite uPred_fupd_eq /uPred_fupd_def. iIntros (E A Φ) "HΦ [Hw HE]".
iAssert (◇ ■ ∀ x : A, Φ x)%I as "#>HP".
{ iIntros (x). by iMod ("HΦ" with "[$Hw $HE]") as "(_&_&?)". }
by iFrame.
- rewrite uPred_fupd_eq /uPred_fupd_def. iIntros (p E1 E2 P) "HP [Hw HE]".
iAssert (▷?p ◇ ■ P)%I with "[-]" as "#HP'"; last by (rewrite plainly_elim; iFrame).
iNext. by iMod ("HP" with "[$]") as "(_ & _ & HP)".
Qed.
Lemma fupd_plain_soundness `{invPreG Σ} E (P: iProp Σ) `{!Plain P}:
(∀ `{Hinv: invG Σ}, (|={⊤, E}=> P)%I) → (▷ P)%I.
(∀ `{Hinv: invG Σ}, (|={⊤,E}=> P)%I) → (▷ P)%I.
Proof.
iIntros (Hfupd). iMod wsat_alloc as (Hinv) "[Hw HE]".
iPoseProof (Hfupd Hinv) as "H".
......@@ -60,30 +69,28 @@ Proof.
Qed.
Lemma step_fupdN_soundness `{invPreG Σ} φ n :
(∀ `{Hinv: invG Σ}, (|={⊤, ∅}▷=>^n |={⊤, ∅}=> ⌜ φ ⌝ : iProp Σ)%I) →
(∀ `{Hinv: invG Σ}, (|={⊤,∅}▷=>^n |={⊤,∅}=> ⌜ φ ⌝ : iProp Σ)%I) →
φ.
Proof.
intros Hiter.
apply (soundness (M:=iResUR Σ) _ (S (S n))); simpl.
apply (fupd_plain_soundness ⊤ _).
intros Hinv. iPoseProof (Hiter Hinv) as "H".
apply (fupd_plain_soundness ⊤ _)=> Hinv.
iPoseProof (Hiter Hinv) as "H". clear Hiter.
destruct n as [|n].
- rewrite //=. iPoseProof (fupd_plain_strong with "H") as "H'".
do 2 iMod "H'"; iModIntro; auto.
- iPoseProof (step_fupdN_mono _ _ _ _ (|={⊤}=> ◇ ⌜φ⌝)%I with "H") as "H'".
{ iIntros "H". iMod (fupd_plain_strong with "H"); auto. }
- iApply fupd_plainly_mask_empty. iMod "H" as %?; auto.
- iDestruct (step_fupdN_wand _ _ _ _ (|={⊤}=> ⌜φ⌝)%I with "H []") as "H'".
{ by iApply fupd_plain_mask_empty. }
rewrite -step_fupdN_S_fupd.
iMod (step_fupdN_plain with "H'") as "Hφ". iModIntro. iNext.
rewrite -later_laterN laterN_later.
iNext. by do 2 iMod "Hφ".
iNext. by iMod "Hφ".
Qed.
Lemma step_fupdN_soundness' `{invPreG Σ} φ n :
(∀ `{Hinv: invG Σ}, (|={⊤, ∅}▷=>^n ⌜ φ ⌝ : iProp Σ)%I) →
(∀ `{Hinv: invG Σ}, (|={⊤,∅}▷=>^n ⌜ φ ⌝ : iProp Σ)%I) →
φ.
Proof.
iIntros (Hiter). eapply (step_fupdN_soundness _ n).
iIntros (Hinv). iPoseProof (Hiter Hinv) as "Hiter".
iApply (step_fupdN_mono with "Hiter").
iIntros (?). iMod (fupd_intro_mask' _ ∅) as "_"; auto.
iApply (step_fupdN_wand with "Hiter"). by iApply (fupd_mask_weaken _ _ _).
Qed.
theories/bi/monpred.v
View file @ b0e4b6fa
......@@ -956,11 +956,17 @@ Proof. move => [] /(_ i). rewrite /Plain monPred_at_plainly bi.forall_elim //. Q
Global Instance monPred_bi_fupd_plainly `{BiFUpdPlainly PROP} : BiFUpdPlainly monPredSI.
Proof.
split; rewrite monPred_fupd_eq; unseal.
- intros E P Q. split=>/= i. do 3 f_equiv.
rewrite monPred_at_plainly (bi.forall_elim _) fupd_plainly_weak //=.
- intros p E1 E2 P; split=>/= i; specialize (later_fupd_plainly p) => HFP.
destruct p; simpl; [ unseal | ]; rewrite monPred_at_plainly (bi.forall_elim _); apply HFP.
split; rewrite !monPred_fupd_eq; try unseal.
- intros E P. split=>/= i.
by rewrite monPred_at_plainly (bi.forall_elim i) fupd_plainly_mask_empty.
- intros E P R. split=>/= i.
rewrite (bi.forall_elim i) bi.pure_True // bi.True_impl.
by rewrite monPred_at_plainly (bi.forall_elim i) fupd_plainly_keep_l.
- intros E P. split=>/= i.
by rewrite monPred_at_plainly (bi.forall_elim i) fupd_plainly_later.
- intros E A Φ. split=>/= i.
rewrite -fupd_plainly_forall_2. apply bi.forall_mono=> x.
by rewrite monPred_at_plainly (bi.forall_elim i).
Qed.
Global Instance plainly_objective `{BiPlainly PROP} P : Objective (■ P).
......
theories/bi/updates.v
View file @ b0e4b6fa
......@@ -54,7 +54,7 @@ Record BiFUpdMixin (PROP : sbi) `(FUpd PROP) := {
bi_fupd_mixin_fupd_trans E1 E2 E3 (P : PROP) : (|={E1,E2}=> |={E2,E3}=> P) ⊢ |={E1,E3}=> P;
bi_fupd_mixin_fupd_mask_frame_r' E1 E2 Ef (P : PROP) :
E1 ## Ef → (|={E1,E2}=> ⌜E2 ## Ef⌝ → P) ={E1 ∪ Ef,E2 ∪ Ef}=∗ P;
bi_fupd_mixin_fupd_frame_r E1 E2 (P Q : PROP) : (|={E1,E2}=> P) ∗ Q ={E1,E2}=∗ P ∗ Q;
bi_fupd_mixin_fupd_frame_r E1 E2 (P R : PROP) : (|={E1,E2}=> P) ∗ R ={E1,E2}=∗ P ∗ R;
}.
Class BiBUpd (PROP : bi) := {
......@@ -79,11 +79,28 @@ Class BiBUpdPlainly (PROP : sbi) `{!BiBUpd PROP, !BiPlainly PROP} :=
bupd_plainly (P : PROP) : (|==> ■ P) -∗ P.
Hint Mode BiBUpdPlainly ! - - : typeclass_instances.
(** These rules for the interaction between the [■] and [|={E1,E2=>] modalities
only make sense for affine logics. From the axioms below, one could derive
[■ P ={E}=∗ P] (see the lemma [fupd_plainly_elim]), which in turn gives
[True ={E}=∗ emp]. *)
Class BiFUpdPlainly (PROP : sbi) `{!BiFUpd PROP, !BiPlainly PROP} := {
fupd_plainly_weak E (P Q : PROP) :
(Q ={E}=∗ ■ P) -∗ Q ={E}=∗ Q ∗ P;
later_fupd_plainly p E1 E2 (P : PROP) :
(▷?p |={E1, E2}=> ■ P) ={E1}=∗ ▷?p ◇ P;
(** When proving a fancy update of a plain proposition, you can also prove it
while being allowed to open all invariants. *)
fupd_plainly_mask_empty E (P : PROP) :
(|={E,∅}=> ■ P) ⊢ |={E}=> P;
(** A strong eliminator (a la modus ponens) for the wand-fancy-update with a
plain conclusion: We eliminate [R ={E}=∗ ■ P] by supplying an [R], but we get
to keep the [R]. *)
fupd_plainly_keep_l E (P R : PROP) :
(R ={E}=∗ ■ P) ∗ R ⊢ |={E}=> P ∗ R;
(** Later "almost" commutes with fancy updates over plain propositions. It
commutes "almost" because of the ◇ modality, which is needed in the definition
of fancy updates so one can remove laters of timeless propositions. *)
fupd_plainly_later E (P : PROP) :
(▷ |={E}=> ■ P) ⊢ |={E}=> ▷ ◇ P;
(** Forall quantifiers commute with fancy updates over plain propositions. *)
fupd_plainly_forall_2 E {A} (Φ : A → PROP) :
(∀ x, |={E}=> ■ Φ x) ⊢ |={E}=> ∀ x, Φ x
}.
Hint Mode BiBUpdFUpd ! - - : typeclass_instances.
......@@ -120,7 +137,7 @@ Section fupd_laws.
Lemma fupd_mask_frame_r' E1 E2 Ef (P : PROP) :
E1 ## Ef → (|={E1,E2}=> ⌜E2 ## Ef⌝ → P) ={E1 ∪ Ef,E2 ∪ Ef}=∗ P.
Proof. eapply bi_fupd_mixin_fupd_mask_frame_r', bi_fupd_mixin. Qed.
Lemma fupd_frame_r E1 E2 (P Q : PROP) : (|={E1,E2}=> P) ∗ Q ={E1,E2}=∗ P ∗ Q.
Lemma fupd_frame_r E1 E2 (P R : PROP) : (|={E1,E2}=> P) ∗ R ={E1,E2}=∗ P ∗ R.
Proof. eapply bi_fupd_mixin_fupd_frame_r, bi_fupd_mixin. Qed.
End fupd_laws.
......@@ -196,8 +213,8 @@ Section fupd_derived.
Lemma fupd_except_0 E1 E2 P : (|={E1,E2}=> ◇ P) ={E1,E2}=∗ P.
Proof. by rewrite {1}(fupd_intro E2 P) except_0_fupd fupd_trans. Qed.
Lemma fupd_frame_l E1 E2 P Q : (P ∗ |={E1,E2}=> Q) ={E1,E2}=∗ P ∗ Q.
Proof. rewrite !(comm _ P); apply fupd_frame_r. Qed.
Lemma fupd_frame_l E1 E2 R Q : (R ∗ |={E1,E2}=> Q) ={E1,E2}=∗ R ∗ Q.
Proof. rewrite !(comm _ R); apply fupd_frame_r. Qed.
Lemma fupd_wand_l E1 E2 P Q : (P -∗ Q) ∗ (|={E1,E2}=> P) ={E1,E2}=∗ Q.
Proof. by rewrite fupd_frame_l wand_elim_l. Qed.
Lemma fupd_wand_r E1 E2 P Q : (|={E1,E2}=> P) ∗ (P -∗ Q) ={E1,E2}=∗ Q.
......@@ -239,8 +256,7 @@ Section fupd_derived.
Proof.
intros ?. rewrite (fupd_mask_frame_r _ _ (E ∖ E1)); last set_solver.
rewrite fupd_trans.
assert (E = E1 ∪ E ∖ E1) as <-; last done.
apply union_difference_L. done.
by replace (E1 ∪ E ∖ E1) with E by (by apply union_difference_L).
Qed.
(* A variant of [fupd_mask_frame] that works well for accessors: Tailored to
elliminate updates of the form [|={E1,E1∖E2}=> Q] and provides a way to
......@@ -335,8 +351,7 @@ Section fupd_derived.
by apply later_mono, fupd_mono.
Qed.
Lemma step_fupd_fupd E P:
(|={E, ∅}▷=> P) ⊣⊢ (|={E, ∅}▷=> |={E}=> P).
Lemma step_fupd_fupd E E' P : (|={E,E'}▷=> P) ⊣⊢ (|={E,E'}▷=> |={E}=> P).
Proof.
apply (anti_symm (⊢)).
- by rewrite -fupd_intro.
......@@ -344,11 +359,20 @@ Section fupd_derived.
Qed.
Lemma step_fupdN_mono E1 E2 n P Q :
(P ⊢ Q) → (|={E1, E2}▷=>^n P) ⊢ (|={E1, E2}▷=>^n Q).
(P ⊢ Q) → (|={E1,E2}▷=>^n P) ⊢ (|={E1,E2}▷=>^n Q).
Proof.
intros HPQ. induction n as [|n IH]=> //=. rewrite IH //.
Qed.
Lemma step_fupdN_wand E1 E2 n P Q :
(|={E1,E2}▷=>^n P) -∗ (P -∗ Q) -∗ (|={E1,E2}▷=>^n Q).
Proof.
apply wand_intro_l. induction n as [|n IH]=> /=.
{ by rewrite wand_elim_l. }
rewrite -IH -fupd_frame_l later_sep -fupd_frame_l.
by apply sep_mono; first apply later_intro.
Qed.
Lemma step_fupdN_S_fupd n E P:
(|={E, ∅}▷=>^(S n) P) ⊣⊢ (|={E, ∅}▷=>^(S n) |={E}=> P).
Proof.
......@@ -366,55 +390,89 @@ Section fupd_derived.
Section fupd_plainly_derived.
Context `{BiPlainly PROP, !BiFUpdPlainly PROP}.
Lemma fupd_plain_weak E P Q `{!Plain P}:
(Q ={E}=∗ P) -∗ Q ={E}=∗ Q ∗ P.
Proof. by rewrite {1}(plain P) fupd_plainly_weak. Qed.
Lemma fupd_plainly_mask E E' P : (|={E,E'}=> ■ P) ⊢ |={E}=> P.
Proof.
rewrite -(fupd_plainly_mask_empty).
apply fupd_elim, (fupd_mask_weaken _ _ _). set_solver.
Qed.
Lemma fupd_plainly_elim E P : ■ P ={E}=∗ P.
Proof. by rewrite (fupd_intro E (■ P)%I) fupd_plainly_mask. Qed.
Lemma fupd_plainly_keep_r E P R : R ∗ (R ={E}=∗ ■ P) ⊢ |={E}=> R ∗ P.
Proof. by rewrite !(comm _ R) fupd_plainly_keep_l. Qed.
Lemma later_fupd_plain p E1 E2 P `{!Plain P} :
(▷?p |={E1, E2}=> P) ={E1}=∗ ▷?p ◇ P.
Proof. by rewrite {1}(plain P) later_fupd_plainly. Qed.
Lemma fupd_plain_mask_empty E P `{!Plain P} : (|={E,∅}=> P) ⊢ |={E}=> P.
Proof. by rewrite {1}(plain P) fupd_plainly_mask_empty. Qed.
Lemma fupd_plain_mask E E' P `{!Plain P} : (|={E,E'}=> P) ⊢ |={E}=> P.
Proof. by rewrite {1}(plain P) fupd_plainly_mask. Qed.
Lemma fupd_plain_strong E1 E2 P `{!Plain P} :
(|={E1, E2}=> P) ={E1}=∗ ◇ P.
Proof. by apply (later_fupd_plain false). Qed.
Lemma fupd_plain_keep_l E P R `{!Plain P} : (R ={E}=∗ P) ∗ R ⊢ |={E}=> P ∗ R.
Proof. by rewrite {1}(plain P) fupd_plainly_keep_l. Qed.
Lemma fupd_plain_keep_r E P R `{!Plain P} : R ∗ (R ={E}=∗ P) ⊢ |={E}=> R ∗ P.
Proof. by rewrite {1}(plain P) fupd_plainly_keep_r. Qed.
Lemma fupd_plain' E1 E2 E2' P Q `{!Plain P} :
E1 ⊆ E2 →
(Q ={E1, E2'}=∗ P) -∗ (|={E1, E2}=> Q) ={E1}=∗ (|={E1, E2}=> Q) ∗ P.
Lemma fupd_plain_later E P `{!Plain P} : (▷ |={E}=> P) ⊢ |={E}=> ▷ ◇ P.
Proof. by rewrite {1}(plain P) fupd_plainly_later. Qed.
Lemma fupd_plain_forall_2 E {A} (Φ : A → PROP) `{!∀ x, Plain (Φ x)} :
(∀ x, |={E}=> Φ x) ⊢ |={E}=> ∀ x, Φ x.
Proof.
intros (E3&->&HE)%subseteq_disjoint_union_L.
apply wand_intro_l. rewrite fupd_frame_r.
rewrite fupd_plain_strong fupd_except_0 fupd_plain_weak wand_elim_r.
rewrite (fupd_mask_mono E1 (E1 ∪ E3)); last by set_solver+.
rewrite fupd_trans -(fupd_trans E1 (E1 ∪ E3) E1).
apply fupd_mono. rewrite -fupd_frame_r.
apply sep_mono; auto. apply fupd_intro_mask; set_solver+.
rewrite -fupd_plainly_forall_2. apply forall_mono=> x.
by rewrite {1}(plain (Φ _)).
Qed.
Lemma fupd_plain E1 E2 P Q `{!Plain P} :
E1 ⊆ E2 → (Q -∗ P) -∗ (|={E1, E2}=> Q) ={E1}=∗ (|={E1, E2}=> Q) ∗ P.
Lemma fupd_plainly_laterN E n P `{HP : !Plain P} :
(▷^n |={E}=> P) ⊢ |={E}=> ▷^n ◇ P.
Proof.
intros HE. rewrite -(fupd_plain' _ _ E1) //. apply wand_intro_l.
by rewrite wand_elim_r -fupd_intro.
revert P HP. induction n as [|n IH]=> P ? /=.
- by rewrite -except_0_intro.
- rewrite -!later_laterN !laterN_later.
rewrite fupd_plain_later. by rewrite IH except_0_later.
Qed.
Lemma step_fupd_plain E P `{!Plain P} :
(|={E, ∅}▷=> P) ={E}=∗ ▷ ◇ P.
Lemma fupd_plain_forall E1 E2 {A} (Φ : A → PROP) `{!∀ x, Plain (Φ x)} :
E2 ⊆ E1 →
(|={E1,E2}=> ∀ x, Φ x) ⊣⊢ (∀ x, |={E1,E2}=> Φ x).
Proof.
specialize (later_fupd_plain true ∅ E P) => //= ->.
rewrite fupd_trans fupd_plain_strong. apply fupd_mono, except_0_later.
intros. apply (anti_symm _).
{ apply forall_intro=> x. by rewrite (forall_elim x). }
trans (∀ x, |={E1}=> Φ x)%I.
{ apply forall_mono=> x. by rewrite fupd_plain_mask. }
rewrite fupd_plain_forall_2. apply fupd_elim.
rewrite {1}(plain (∀ x, Φ x)) (fupd_mask_weaken E1 E2 (■ _)%I) //.
apply fupd_elim. by rewrite fupd_plainly_elim.
Qed.
Lemma fupd_plain_forall' E {A} (Φ : A → PROP) `{!∀ x, Plain (Φ x)} :
(|={E}=> ∀ x, Φ x) ⊣⊢ (∀ x, |={E}=> Φ x).
Proof. by apply fupd_plain_forall. Qed.
Lemma step_fupdN_plain E n P `{!Plain P}:
(|={E, ∅}▷=>^n P) ={E}=∗ ▷^n ◇ P.
Lemma step_fupd_plain E E' P `{!Plain P} : (|={E,E'}▷=> P) ={E}=∗ ▷ ◇ P.
Proof.
rewrite -(fupd_plain_mask _ E' (▷ ◇ P)%I).
apply fupd_elim. by rewrite fupd_plain_mask -fupd_plain_later.
Qed.
Lemma step_fupdN_plain E E' n P `{!Plain P} : (|={E,E'}▷=>^n P) ={E}=∗ ▷^n ◇ P.
Proof.
induction n as [|n IH].
- rewrite -fupd_intro. apply except_0_intro.
- rewrite Nat_iter_S step_fupd_fupd IH ?fupd_trans step_fupd_plain.
apply fupd_mono. destruct n; simpl.
- by rewrite -fupd_intro -except_0_intro.
- rewrite Nat_iter_S step_fupd_fupd IH !fupd_trans step_fupd_plain.
apply fupd_mono. destruct n as [|n]; simpl.
* by rewrite except_0_idemp.
* by rewrite except_0_later.
Qed.
End fupd_plainly_derived.
Lemma step_fupd_plain_forall E1 E2 {A} (Φ : A → PROP) `{!∀ x, Plain (Φ x)} :
E2 ⊆ E1 →
(|={E1,E2}▷=> ∀ x, Φ x) ⊣⊢ (∀ x, |={E1,E2}▷=> Φ x).
Proof.
intros. apply (anti_symm _).
{ apply forall_intro=> x. by rewrite (forall_elim x). }
trans (∀ x, |={E1}=> ▷ ◇ Φ x)%I.
{ apply forall_mono=> x. by rewrite step_fupd_plain. }
rewrite -fupd_plain_forall'. apply fupd_elim.
rewrite -(fupd_except_0 E2 E1) -step_fupd_intro //.
by rewrite -later_forall -except_0_forall.
Qed.
End fupd_plainly_derived.
End fupd_derived.
theories/program_logic/adequacy.v
View file @ b0e4b6fa
......@@ -44,7 +44,7 @@ Notation wptp s t := ([∗ list] ef ∈ t, WP ef @ s; ⊤ {{ _, True }})%I.
Lemma wp_step s E e1 σ1 κ κs e2 σ2 efs Φ :
prim_step e1 σ1 κ e2 σ2 efs →
state_interp σ1 (κ ++ κs) ∗ WP e1 @ s; E {{ Φ }}
={E, ∅}▷=∗ (state_interp σ2 κs ∗ WP e2 @ s; E {{ Φ }} ∗ wptp s efs).
={E,∅}▷=∗ (state_interp σ2 κs ∗ WP e2 @ s; E {{ Φ }} ∗ wptp s efs).
Proof.
rewrite {1}wp_unfold /wp_pre. iIntros (?) "[Hσ H]".
rewrite (val_stuck e1 σ1 κ e2 σ2 efs) //.
......@@ -57,7 +57,7 @@ Lemma wptp_step s e1 t1 t2 κ κs σ1 σ2 Φ :
step (e1 :: t1,σ1) κ (t2, σ2) →
state_interp σ1 (κ ++ κs) ∗ WP e1 @ s; ⊤ {{ Φ }} ∗ wptp s t1
==∗ ∃ e2 t2',
⌜t2 = e2 :: t2'⌝ ∗ |={⊤, ∅}▷=> (state_interp σ2 κs ∗ WP e2 @ s; ⊤ {{ Φ }} ∗ wptp s t2').
⌜t2 = e2 :: t2'⌝ ∗ |={⊤,∅}▷=> (state_interp σ2 κs ∗ WP e2 @ s; ⊤ {{ Φ }} ∗ wptp s t2').
Proof.
iIntros (Hstep) "(HW & He & Ht)".
destruct Hstep as [e1' σ1' e2' σ2' efs [|? t1'] t2' ?? Hstep]; simplify_eq/=.
......@@ -71,7 +71,7 @@ Qed.
Lemma wptp_steps s n e1 t1 κs κs' t2 σ1 σ2 Φ :
nsteps n (e1 :: t1, σ1) κs (t2, σ2) →
state_interp σ1 (κs ++ κs') ∗ WP e1 @ s; ⊤ {{ Φ }} ∗ wptp s t1 ⊢
|={⊤, ∅}▷=>^n (∃ e2 t2',
|={⊤,∅}▷=>^n (∃ e2 t2',
⌜t2 = e2 :: t2'⌝ ∗ state_interp σ2 κs' ∗ WP e2 @ s; ⊤ {{ Φ }} ∗ wptp s t2').
Proof.
revert e1 t1 κs κs' t2 σ1 σ2; simpl; induction n as [|n IH]=> e1 t1 κs κs' t2 σ1 σ2 /=.
......@@ -88,15 +88,15 @@ Lemma wptp_result s n e1 t1 κs κs' v2 t2 σ1 σ2 φ :
state_interp σ1 (κs ++ κs') ∗
WP e1 @ s; ⊤ {{ v, ∀ σ, state_interp σ κs' ={⊤,∅}=∗ ⌜φ v σ⌝ }} ∗
wptp s t1 ⊢
|={⊤, ∅}▷=>^(S n) ⌜φ v2 σ2⌝.
|={⊤,∅}▷=>^(S n) ⌜φ v2 σ2⌝.
Proof.
intros. rewrite Nat_iter_S_r wptp_steps //.
apply step_fupdN_mono.
iDestruct 1 as (e2 t2' ?) "(Hσ & H & _)"; simplify_eq.
iMod (wp_value_inv' with "H") as "H".
iMod (later_fupd_plain false ⊤ ∅ (⌜φ v2 σ2⌝)%I with "[H Hσ]") as ">#%".
{ rewrite //=. by iMod ("H" with "Hσ") as "$". }
iApply (step_fupd_mask_mono ∅ _ _ ∅); auto.
iMod (fupd_plain_mask_empty _ ⌜φ v2 σ2⌝%I with "[H Hσ]") as %?.
{ by iMod ("H" with "Hσ") as "$". }
by iApply step_fupd_intro.
Qed.
Lemma wp_safe E e σ κs Φ :
......@@ -105,8 +105,8 @@ Proof.
rewrite wp_unfold /wp_pre. iIntros "Hσ H".
destruct (to_val e) as [v|] eqn:?.
{ iApply (step_fupd_mask_mono ∅ _ _ ∅); eauto. set_solver. }
iMod (later_fupd_plain false E ∅ (⌜reducible e σ⌝)%I with "[H Hσ]") as ">#%".
{ rewrite //=. by iMod ("H" $! σ [] κs with "Hσ") as "($&H)". }
iMod (fupd_plain_mask_empty _ ⌜reducible e σ⌝%I with "[H Hσ]") as %?.
{ by iMod ("H" $! σ [] κs with "Hσ") as "($&H)". }
iApply step_fupd_intro; first by set_solver+.
iIntros "!> !%". by right.
Qed.
......@@ -114,7 +114,7 @@ Qed.
Lemma wptp_safe n e1 κs κs' e2 t1 t2 σ1 σ2 Φ :
nsteps n (e1 :: t1, σ1) κs (t2, σ2) → e2 ∈ t2 →
state_interp σ1 (κs ++ κs') ∗ WP e1 {{ Φ }} ∗ wptp NotStuck t1
⊢ |={⊤, ∅}▷=>^(S n) ⌜is_Some (to_val e2) ∨ reducible e2 σ2⌝.
⊢ |={⊤,∅}▷=>^(S n) ⌜is_Some (to_val e2) ∨ reducible e2 σ2⌝.
Proof.
intros ? He2. rewrite Nat_iter_S_r wptp_steps //.
apply step_fupdN_mono.
......@@ -126,14 +126,14 @@ Qed.
Lemma wptp_invariance s n e1 κs κs' e2 t1 t2 σ1 σ2 φ Φ :
nsteps n (e1 :: t1, σ1) κs (t2, σ2) →
(state_interp σ2 κs' ={⊤,∅}=∗ ⌜φ⌝) ∗ state_interp σ1 (κs ++ κs') ∗ WP e1 @ s; ⊤ {{ Φ }} ∗ wptp s t1
⊢ |={⊤, ∅}▷=>^(S n) |={⊤,∅}=> ⌜φ⌝.
(state_interp σ2 κs' ={⊤,∅}=∗ ⌜φ⌝) ∗
state_interp σ1 (κs ++ κs') ∗ WP e1 @ s; ⊤ {{ Φ }} ∗ wptp s t1
⊢ |={⊤,∅}▷=>^(S n) |={⊤,∅}=> ⌜φ⌝.
Proof.
intros ?. rewrite Nat_iter_S_r wptp_steps // step_fupdN_frame_l.
apply step_fupdN_mono.
iIntros "[Hback H]"; iDestruct "H" as (e2' t2' ->) "[Hσ _]".
iSpecialize ("Hback" with "Hσ").
iApply (step_fupd_mask_mono ∅ _ _ ∅); auto.
iSpecialize ("Hback" with "Hσ"). by iApply step_fupd_intro.
Qed.
End adequacy.
......@@ -146,15 +146,13 @@ Theorem wp_strong_adequacy Σ Λ `{invPreG Σ} s e σ φ :
Proof.
intros Hwp; split.
- intros t2 σ2 v2 [n [κs ?]]%erased_steps_nsteps.
eapply (step_fupdN_soundness' _ (S (S n))).
iIntros (Hinv).
eapply (step_fupdN_soundness' _ (S (S n)))=> Hinv.
rewrite Nat_iter_S.
iMod Hwp as (Istate) "[HI Hwp]".
iApply (step_fupd_mask_mono ∅ _ _ ∅); auto. iModIntro. iNext; iModIntro.
iApply (@wptp_result _ _ (IrisG _ _ _ Hinv Istate) _ _ _ _ _ []); eauto with iFrame.
- destruct s; last done. intros t2 σ2 e2 _ [n [κs ?]]%erased_steps_nsteps ?.
eapply (step_fupdN_soundness' _ (S (S n))).
iIntros (Hinv).
eapply (step_fupdN_soundness' _ (S (S n)))=> Hinv.
rewrite Nat_iter_S.
iMod Hwp as (Istate) "[HI Hwp]".
iApply (step_fupd_mask_mono ∅ _ _ ∅); auto.
......@@ -184,11 +182,10 @@ Theorem wp_invariance Σ Λ `{invPreG Σ} s e σ1 t2 σ2 φ :
φ.
Proof.
intros Hwp [n [κs ?]]%erased_steps_nsteps.
eapply (step_fupdN_soundness _ (S (S n))).
iIntros (Hinv).
eapply (step_fupdN_soundness _ (S (S n)))=> Hinv.
rewrite Nat_iter_S.
iMod (Hwp Hinv κs []) as (Istate) "(HIstate & Hwp & Hclose)".
iApply (step_fupd_mask_mono ∅ _ _ ∅); auto.
iApply step_fupd_intro; first done.
iApply (@wptp_invariance _ _ (IrisG _ _ _ Hinv Istate)); eauto with iFrame.
Qed.
......
theories/program_logic/total_adequacy.v
View file @ b0e4b6fa
From iris.program_logic Require Export total_weakestpre adequacy.
From iris.algebra Require Import gmap auth agree gset coPset list.
From iris.bi Require Import big_op fixpoint.
From iris.base_logic.lib Require Import wsat.
From iris.proofmode Require Import tactics.
Set Default Proof Using "Type".
Import uPred.
......@@ -99,18 +98,15 @@ Proof.
iApply (twptp_app [_] with "[IH']"); [by iApply "IH'"|by iApply "IH"].
Qed.
Notation world σ := (wsat ∗ ownE ⊤ ∗ state_interp σ [])%I.
Lemma twptp_total σ t : world σ -∗ twptp t -∗ ▷ ⌜sn erased_step (t, σ)⌝.
Lemma twptp_total σ t :
state_interp σ [] -∗ twptp t ={⊤}=∗ ▷ ⌜sn erased_step (t, σ)⌝.
Proof.
iIntros "Hw Ht". iRevert (σ) "Hw". iRevert (t) "Ht".
iApply twptp_ind; iIntros "!#" (t) "IH"; iIntros (σ) "(Hw&HE&Hσ)".
iApply twptp_ind; iIntros "!#" (t) "IH"; iIntros (σ) "Hσ".
iApply (pure_mono _ _ (Acc_intro _)). iIntros ([t' σ'] [κ Hstep]).
rewrite /twptp_pre uPred_fupd_eq /uPred_fupd_def.
iMod ("IH" with "[% //] Hσ [$Hw $HE]") as ">(Hw & HE & % & Hσ & [IH _])".
iApply "IH". by iFrame.
iMod ("IH" with "[% //] Hσ") as (->) "[Hσ [H _]]".
by iApply "H".
Qed.
End adequacy.
Theorem twp_total Σ Λ `{invPreG Σ} s e σ Φ :
......@@ -120,11 +116,9 @@ Theorem twp_total Σ Λ `{invPreG Σ} s e σ Φ :
stateI σ [] ∗ WP e @ s; ⊤ [{ Φ }])%I) →
sn erased_step ([e], σ). (* i.e. ([e], σ) is strongly normalizing *)
Proof.
intros Hwp.
eapply (soundness (M:=iResUR Σ) _ 1); iIntros "/=".
iMod wsat_alloc as (Hinv) "[Hw HE]". specialize (Hwp Hinv).
rewrite uPred_fupd_eq in Hwp; iMod (Hwp with "[$Hw $HE]") as ">(Hw & HE & Hwp)".
iDestruct "Hwp" as (Istate) "[HI Hwp]".
iApply (@twptp_total _ _ (IrisG _ _ _ Hinv Istate) with "[$Hw $HE $HI]").
by iApply (@twp_twptp _ _ (IrisG _ _ _ Hinv Istate)).
intros Hwp. apply (soundness (M:=iResUR Σ) _ 2); simpl.
apply (fupd_plain_soundness ⊤ _)=> Hinv.
iMod (Hwp) as (stateI) "[Hσ H]".
iApply (@twptp_total _ _ (IrisG _ _ _ Hinv stateI) with "Hσ").
by iApply (@twp_twptp _ _ (IrisG _ _ _ Hinv stateI)).
Qed.
theories/proofmode/class_instances_sbi.v
View file @ b0e4b6fa
......@@ -321,6 +321,24 @@ Global Instance from_forall_plainly `{BiPlainly PROP} {A} P (Φ : A → PROP) :
FromForall P Φ → FromForall (■ P)%I (λ a, ■ (Φ a))%I.
Proof. rewrite /FromForall=> <-. by rewrite plainly_forall. Qed.
Global Instance from_forall_fupd `{BiFUpdPlainly PROP} E1 E2 {A} P (Φ : A → PROP) :
(* Some cases in which [E2 ⊆ E1] holds *)
TCOr (TCEq E1 E2) (TCOr (TCEq E1 ⊤) (TCEq E2 ∅)) →
FromForall P Φ → (∀ x, Plain (Φ x)) →
FromForall (|={E1,E2}=> P)%I (λ a, |={E1,E2}=> (Φ a))%I.
Proof.
rewrite /FromForall=> -[->|[->|->]] <- ?; rewrite fupd_plain_forall; set_solver.
Qed.
Global Instance from_forall_step_fupd `{BiFUpdPlainly PROP} E1 E2 {A} P (Φ : A → PROP) :
(* Some cases in which [E2 ⊆ E1] holds *)
TCOr (TCEq E1 E2) (TCOr (TCEq E1 ⊤) (TCEq E2 ∅)) →
FromForall P Φ → (∀ x, Plain (Φ x)) →
FromForall (|={E1,E2}▷=> P)%I (λ a, |={E1,E2}▷=> (Φ a))%I.
Proof.
rewrite /FromForall=> -[->|[->|->]] <- ?; rewrite step_fupd_plain_forall; set_solver.
Qed.
(** IsExcept0 *)
Global Instance is_except_0_except_0 P : IsExcept0 (◇ P).
Proof. by rewrite /IsExcept0 except_0_idemp. Qed.
......
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