Generalize the [boolean] type.

examples/proofs/latch/latch_def.v

@@ -12,9 +12,15 @@ Section type.
     l `has_layout_loc` struct_latch →
     l ↦ LATCH_INIT ={E}=∗ l ◁ₗ{Shr} P @ latch.
   Proof.
-    iIntros (? ?) "Hl".
-    iApply ty_share => //. unshelve iApply (@ty_ref  with "[] Hl").
-    { apply _. } { apply: (UntypedOp struct_latch). } { apply: MCNone. } { solve_goal. } { done. }
-    rewrite /ty_own_val/=. repeat iSplit => //. rewrite /ty_own_val/=/ty_own_val/=. iSplit => //. by iExists false.
+    iIntros (? ?) "Hl". iApply ty_share => //.
+    unshelve iApply (@ty_ref  with "[] Hl").
+    { apply _. }
+    { apply: (UntypedOp struct_latch). }
+    { apply: MCNone. }
+    { solve_goal. }
+    { done. }
+    rewrite /ty_own_val/=. repeat iSplit => //.
+    rewrite /ty_own_val /= /ty_own_val /=. iSplit => //.
+    iExists false. iSplit; last done. by iExists _.
   Qed.
 End type.

linux/casestudies/proofs/pgtable/pgtable_lemmas.v

@@ -145,10 +145,6 @@ Ltac simpl_bool_hyp :=
     assert (b = false) by apply negb_true_iff; clear H
   | [ H : negb ?b = false |- _ ] =>
     assert (b = true) by apply negb_false_iff; clear H
-  | [ H : 0 = Z_of_bool ?b |- _ ] =>
-    assert (b = false) by (by apply Z_of_bool_false); clear H
-  | [ H : 0 ≠ Z_of_bool ?b |- _ ] =>
-    assert (b = true) by (by apply Z_of_bool_true); clear H
   | [ H : bf_cons ?a 1 (Z_of_bool ?b) bf_nil = 0 |- _ ] =>
     assert (b = false) by (by apply (bf_cons_bool_singleton_false_iff a b)); clear H
   | [ H : bf_cons ?a 1 (Z_of_bool ?b) bf_nil ≠ 0 |- _ ] =>

linux/pkvm/proofs/spinlock/spinlock_proof.v

@@ -84,7 +84,7 @@ Section proofs.
     - (* #1 First loop (after the initial run), checking if we got the ticket. *)
       destruct s.
       + repeat liRStep; liShow. iIntros "Hb".
-        repeat liRStep; liShow. 2: { destruct b => //. iFrame. }
+        repeat liRStep; liShow.
         iDestruct select (hyp_spinlock_t_invariant _ _ _) as (owner next) "([%%]&?&?&?&?&?&?)".
         repeat liRStep; liShow.
         liInst Hevar next.
@@ -93,7 +93,7 @@ Section proofs.
         liInst Hevar owner. liInst Hevar0 next.
         repeat liRStep; liShow.
       + repeat liRStep; liShow. iIntros "Hb".
-        repeat liRStep; liShow. 2: { destruct b => //. iFrame. }
+        repeat liRStep; liShow.
         iExists (Shr, tytrue); iSplitR; first by simpl.
         iDestruct select (inv _ _) as "#Hinv".
         iInv "Hinv" as ">Inv".
@@ -129,6 +129,7 @@ Section proofs.
              iDestruct select (p at{_}ₗ _ ◁ᵥ _)%I as "[_ ->]".
              iApply (wp_cas_suc_int with "Hnext Hticket [$]"). { cbv. lia. } done.
              iNext. iIntros "??". iApply ("HΦ" $! _ (t2mt (true @ boolean bool_it))%I) => //.
+             { iExists _. done. }
              repeat liRStep; liShow.
              rewrite /hyp_spinlock_t_invariant.
              repeat liRStep; liShow.
@@ -151,6 +152,7 @@ Section proofs.
              iDestruct select (p at{_}ₗ _ ◁ᵥ _)%I as "[_ ->]".
              iApply (wp_cas_fail_int with "Hnext Hticket [$]"). { cbv. lia. } done.
              iNext. iIntros "??". iApply ("HΦ" $! _ (t2mt (false @ boolean bool_it))%I) => //.
+             { by iExists _. }
              repeat liRStep; liShow.
              rewrite /hyp_spinlock_t_invariant.
              repeat liRStep; liShow.
@@ -188,6 +190,7 @@ Section proofs.
              iDestruct select (p at{_}ₗ _ ◁ᵥ _)%I as "[_ ->]".
              iApply (wp_cas_suc_int with "Hnext Hticket [$]"). { cbv. lia. } done.
              iNext. iIntros "??". iApply ("HΦ" $! _ (t2mt (true @ boolean bool_it))%I) => //.
+             { by iExists _. }
              iRename select (p at{struct_hyp_spinlock}ₗ "next" ◁ₗ _)%I into "Hnext".
              iDestruct "Hrest" as "(Hfrag&Hr1&Hr2&Hcases)".
              iDestruct (split_first_ticket with "Hr2") as "[Hticket Hr2]".
@@ -206,6 +209,7 @@ Section proofs.
              iDestruct select (p at{_}ₗ _ ◁ᵥ _)%I as "[_ ->]".
              iApply (wp_cas_fail_int with "Hnext Hticket [$]"). { cbv. lia. } done.
              iNext. iIntros "??". iApply ("HΦ" $! _ (t2mt (false @ boolean bool_it))%I) => //.
+             { by iExists _. }
              iRename select (p at{struct_hyp_spinlock}ₗ _ ◁ₗ _)%I into "Hnext".
              iMod ("Hclose_inv" with "[Howner Hnext Hrest]") as "_".
              { iNext. iExists owner, next. iFrame "Howner". iFrame "Hnext". iFrame "Hrest". done. }

theories/lithium/simpl_instances.v

@@ -210,6 +210,16 @@ Proof. split; destruct b; naive_solver. Qed.
 Global Instance simpl_Z_to_bool_1 (b : bool) : SimplBothRel (=) 1 (Z_of_bool b) (b = true).
 Proof. split; destruct b; naive_solver. Qed.
 
+(* Using a SimplBothRel does not work since [x ≠ y] (i.e., [not (x = y)]) does
+not unify with [?R ?x ?y] (Coq's unification is too limited here). This can be
+seen by applying [simpl_both_rel_inst2], which given the following error:
+[Unable to unify "?Goal1 ?Goal2 ?Goal3" with "0 = Z_of_bool _b_ → False"] *)
+(*Global Instance simpl_Z_to_bool_nonzero b: SimplBothRel (≠) 0 (Z_of_bool b) (b = true).*)
+Global Instance simpl_Z_to_bool_nonzero_1 b : SimplBoth (Z_of_bool b ≠ 0) (b = true).
+Proof. by destruct b. Qed.
+Global Instance simpl_Z_to_bool_nonzero_2 b : SimplBoth (0 ≠ Z_of_bool b) (b = true).
+Proof. by destruct b. Qed.
+
 Global Instance simpl_add_eq_0 n m:
   SimplBothRel (=) (n + m)%nat (0)%nat (n = 0%nat ∧ m = 0%nat).
 Proof. split; naive_solver lia. Qed.

theories/typing/atomic_bool.v

 From refinedc.typing Require Export type.
-From refinedc.typing Require Import programs int.
+From refinedc.typing Require Import programs boolean int.
 Set Default Proof Using "Type".
 
 Definition atomic_boolN : namespace := nroot.@"atomic_boolN".
@@ -52,7 +52,7 @@ Section atomic_bool.
       iInv "Hl" as "(%b&>Hb&?)" "Hclose".
       iApply fupd_mask_intro; [set_solver|]. iIntros "_".
       rewrite /ty_own/=.
-      iDestruct "Hb" as "(%v&%&%&?)". iExists _, _. iFrame. iPureIntro.
+      iDestruct "Hb" as "(%v&%n&%&%&%&?)". iExists _, _. iFrame. iPureIntro.
       erewrite val_to_Z_length; [|done]. lia.
   Qed.
 
@@ -166,34 +166,35 @@ Section programs.
     destruct β.
     - iDestruct "Hl" as (b) "[Hb Hif]".
       destruct (decide (b = bexp)); subst.
-      + iApply (wp_cas_suc_bool with "Hb Hlexp") => //.
+      + iApply (wp_cas_suc_boolean with "Hb Hlexp") => //.
         iIntros "!# Hb Hexp".
         iDestruct "Hsub" as "[Hsub _]". iDestruct ("Hsub" with "Hif") as "[Hif HT]".
-        iApply "HΦ". 2: iApply ("HT" with "[Hb Hif] Hexp"). done.
-        iExists bnew. by iFrame.
-      + iApply (wp_cas_fail_bool with "Hb Hlexp") => //.
-        iIntros "!# Hb Hexp".
-        iDestruct "Hsub" as "[_ HT]".
-        iApply "HΦ". 2: iApply ("HT" with "[Hb Hif]"). done.
-        * iExists b. iFrame.
-        * by destruct b, bexp.
+        iApply "HΦ"; last first.
+        * iApply ("HT" with "[Hb Hif] Hexp"). iExists bnew. by iFrame.
+        * by iExists _.
+      + iApply (wp_cas_fail_boolean with "Hb Hlexp") => //.
+        iIntros "!# Hb Hexp". iDestruct "Hsub" as "[_ HT]".
+        iApply "HΦ"; last first.
+        * iApply ("HT" with "[Hb Hif]"). { iExists _. by iFrame. } by destruct b, bexp.
+        * by iExists _.
     - iDestruct "Hl" as (?) "#Hinv".
       iInv "Hinv" as "Hb".
       iDestruct "Hb" as (b) "[>Hmt Hif]".
       destruct (decide (b = bexp)); subst.
-      + iApply (wp_cas_suc_bool with "Hmt Hlexp") => //.
+      + iApply (wp_cas_suc_boolean with "Hmt Hlexp") => //.
         iIntros "!# Hb Hexp".
         iDestruct "Hsub" as "[Hsub _]". iDestruct ("Hsub" with "Hif") as "[Hif HT]".
         iModIntro. iSplitL "Hb Hif". { iExists bnew. iFrame. }
-        iApply "HΦ". 2: iApply ("HT" with "[] Hexp"). done.
-        by iSplit.
-      + iApply (wp_cas_fail_bool with "Hmt Hlexp") => //.
+        iApply "HΦ"; last first.
+        * iApply ("HT" with "[] Hexp"). by iSplit.
+        * by iExists _.
+      + iApply (wp_cas_fail_boolean with "Hmt Hlexp") => //.
         iIntros "!# Hb Hexp".
         iDestruct "Hsub" as "[_ HT]".
         iModIntro. iSplitL "Hb Hif". { by iExists b; iFrame; rewrite /i2v Hvnew. }
-        iApply "HΦ". 2: iApply ("HT" with "[]"). done.
-        * by iSplit.
-        * by destruct b, bexp.
+        iApply "HΦ"; last first.
+        * iApply ("HT" with "[]"); first by iSplit. by destruct b, bexp.
+        * by iExists _.
   Qed.
   Global Instance type_cas_atomic_bool_inst (l : loc) β it PT PF (lexp : loc) Pexp vnew Pnew:
     TypedCas (IntOp it) l (l ◁ₗ{β} (atomic_bool it PT PF))%I lexp Pexp vnew Pnew :=

theories/typing/bitfield.v

 From refinedc.lithium Require Import simpl_classes.
 From refinedc.lang Require Export bitfield.
-From refinedc.typing Require Import programs int.
+From refinedc.typing Require Import programs boolean int.
 From refinedc.typing Require Export type.
 Set Default Proof Using "Type".
 
@@ -256,7 +256,7 @@ Section programs.
     { rewrite (bool_decide_iff _ (bv = 0)) //.
       rewrite Hbv (bool_decide_iff _ (b = false)); last by apply bf_cons_bool_singleton_false_iff.
       by destruct b. }
-    iExists _. by iFrame.
+    iExists _. iFrame. iIntros "(%n&%&%Heq)". move: Heq => /= ?. subst n. done.
   Qed.
   Global Instance type_bitfield_raw_is_false_inst it v1 v2 bv :
     TypedBinOpVal v1 (0 @ int it)%I v2 (bv @ bitfield_raw it)%I (EqOp i32) (IntOp it) (IntOp it) :=
@@ -275,7 +275,7 @@ Section programs.
     { rewrite (bool_decide_iff _ (bv ≠ 0)) //.
       rewrite Hbv (bool_decide_iff _ (b = true)); last by apply bf_cons_bool_singleton_true_iff.
       by destruct b. }
-    iExists _. by iFrame.
+    iExists _. iFrame. iIntros "(%n&%&%Heq)". move: Heq => /= ?. subst n. done.
   Qed.
   Global Instance type_bitfield_raw_is_true_inst it v1 v2 bv :
     TypedBinOpVal v1 (0 @ int it)%I v2 (bv @ bitfield_raw it)%I (NeOp i32) (IntOp it) (IntOp it) :=

theories/typing/boolean.v

+From refinedc.typing Require Export type.
+From refinedc.typing Require Import programs.
+Set Default Proof Using "Type".
+
+(** A [Strict] boolean can only have value 0 (false) or 1 (true). A [Relaxed]
+boolean can have any value: 0 means false, anything else means true. *)
+Inductive strictness := Strict | Relaxed.
+
+Definition represents_boolean (stn: strictness) (n: Z) (b: bool) : Prop :=
+  match stn with
+  | Strict  => n = Z_of_bool b
+  | Relaxed => bool_decide (n ≠ 0) = b
+  end.
+
+Lemma represents_boolean_eq (stn: strictness) (n: Z) (b: bool) :
+  represents_boolean stn n b → bool_decide (n ≠ 0) = b.
+Proof.
+  destruct stn => //=. move => ->. by destruct b.
+Qed.
+
+Section generic_boolean.
+  Context `{!typeG Σ}.
+
+  Program Definition generic_boolean_inner_type (stn: strictness) (it: int_type) (b: bool) : type := {|
+    ty_own β l :=
+      ∃ v n, ⌜val_to_Z v it = Some n⌝ ∗
+             ⌜represents_boolean stn n b⌝ ∗
+             ⌜l `has_layout_loc` it⌝ ∗
+             l ↦[β] v;
+  |}%I.
+  Next Obligation.
+    iIntros (??????) "(%v&%n&%&%&%&Hl)". iExists v, n.
+    do 3 (iSplitR; first done). by iApply heap_mapsto_own_state_share.
+  Qed.
+
+  Program Definition generic_boolean (stn: strictness) (it: int_type) : rtype := {|
+    rty_type := bool;
+    rty := generic_boolean_inner_type stn it;
+  |}.
+
+  Global Program Instance rmovable_generic_boolean stn it : RMovable (generic_boolean stn it) := {|
+    rmovable b := {|
+      ty_has_op_type ot mt := is_int_ot ot it;
+      ty_own_val v := ∃ n, ⌜val_to_Z v it = Some n⌝ ∗ ⌜represents_boolean stn n b⌝;
+    |}
+  |}%I.
+  Next Obligation. iIntros (?????? ->%is_int_ot_layout) "(%&%&_&_&$&_)". Qed.
+  Next Obligation. iIntros (?????? ->%is_int_ot_layout [?[H _]]) "!%". by apply val_to_Z_length in H. Qed.
+  Next Obligation. iIntros (???????) "(%v&%n&%&%&%&?)". eauto with iFrame. Qed.
+  Next Obligation. iIntros (?????? v ->%is_int_ot_layout ?) "Hl (%n&%&%)". iExists v, n. eauto with iFrame. Qed.
+  Next Obligation. iIntros (????????). apply: mem_cast_compat_int; [naive_solver|]. iPureIntro; naive_solver. Qed.
+
+  Global Program Instance generic_boolean_copyable b stn it : Copyable (b @ generic_boolean stn it).
+  Next Obligation.
+    iIntros (??????? ->%is_int_ot_layout) "(%v&%n&%&%&%&Hl)".
+    iMod (heap_mapsto_own_state_to_mt with "Hl") as (q) "[_ Hl]" => //.
+    iSplitR; first done. iExists q, v. iFrame. iModIntro. eauto 6 with iFrame.
+  Qed.
+
+  Global Instance alloc_alive_generic_boolean b stn it β: AllocAlive (b @ generic_boolean stn it) β True.
+  Proof.
+    constructor. iIntros (l ?) "(%&%&%&%&%&Hl)".
+    iApply (heap_mapsto_own_state_alloc with "Hl").
+    erewrite val_to_Z_length; [|done]. have := bytes_per_int_gt_0 it. lia.
+  Qed.
+
+  Global Instance generic_boolean_timeless l b stn it:
+    Timeless (l ◁ₗ b @ generic_boolean stn it)%I.
+  Proof. apply _. Qed.
+
+End generic_boolean.
+Notation "generic_boolean< stn , it >" := (generic_boolean stn it)
+  (only printing, format "'generic_boolean<' stn ',' it '>'") : printing_sugar.
+
+Notation boolean := (generic_boolean Strict) (only parsing).
+Notation "boolean< it >" := (boolean it)
+  (only printing, format "'boolean<' it '>'") : printing_sugar.
+
+Section programs.
+  Context `{!typeG Σ}.
+
+  Inductive destruct_hint_if_bool :=
+  | DestructHintIfBool (b : bool).
+
+  Lemma type_if_generic_boolean stn it (b : bool) v T1 T2 :
+    destruct_hint (DHintDestruct _ b) (DestructHintIfBool b) (if b then T1 else T2) -∗
+    typed_if (IntOp it) v (v ◁ᵥ b @ generic_boolean stn it) T1 T2.
+  Proof.
+    unfold destruct_hint. iIntros "Hs (%n&%Hv&%Hb)".
+    rewrite <-(represents_boolean_eq stn n b); last done. eauto with iFrame.
+  Qed.
+  Global Instance type_if_generic_boolean_inst stn it b v :
+    TypedIf (IntOp it) v (v ◁ᵥ b @ generic_boolean stn it)%I :=
+    λ T1 T2, i2p (type_if_generic_boolean stn it b v T1 T2).
+
+  Lemma type_assert_generic_boolean stn it (b : bool) s Q fn ls R v :
+    (⌜b⌝ ∗ typed_stmt s fn ls R Q) -∗
+    typed_assert (IntOp it) v (v ◁ᵥ b @ generic_boolean stn it) s fn ls R Q.
+  Proof.
+    iIntros "[%H $] (%n&%&%Hb)". destruct b; last by exfalso.
+    iExists n. iSplit; first done. iPureIntro.
+    by apply represents_boolean_eq, bool_decide_eq_true in Hb.
+  Qed.
+  Global Instance type_assert_generic_boolean_inst stn it b v :
+    TypedAssert (IntOp it) v (v ◁ᵥ b @ generic_boolean stn it)%I :=
+    λ s fn ls R Q, i2p (type_assert_generic_boolean _ _ _ _ _ _ _ _ _).
+End programs.
+
+Section boolean.
+  Context `{!typeG Σ}.
+
+  Lemma type_relop_boolean it v1 b1 v2 b2 T b op:
+    match op with
+    | EqOp rit => Some (eqb b1 b2       , rit)
+    | NeOp rit => Some (negb (eqb b1 b2), rit)
+    | _ => None
+    end = Some (b, i32) →
+    T (i2v (Z_of_bool b) i32) (t2mt (b @ boolean i32)) -∗
+    typed_bin_op v1 (v1 ◁ᵥ b1 @ boolean it)
+                 v2 (v2 ◁ᵥ b2 @ boolean it) op (IntOp it) (IntOp it) T.
+  Proof.
+    iIntros "%Hop HT (%n1&%Hv1&%Hb1) (%n2&%Hv2&%Hb2) %Φ HΦ".
+    have [v Hv]:= val_of_Z_bool_is_Some None i32 b.
+    iApply (wp_binop_det_pure (i2v (Z_of_bool b) i32)).
+    { rewrite /i2v Hv /=. destruct op, b1, b2; simplify_eq.
+      all: split; [inversion 1; simplify_eq /=; done | move => ->]; simplify_eq /=.
+      all: econstructor => //; by case_bool_decide. }
+    iApply "HΦ"; last done. iExists (Z_of_bool b).
+    iSplit; [by destruct b | done].
+  Qed.
+
+  Global Program Instance type_eq_boolean_inst it v1 b1 v2 b2:
+    TypedBinOpVal v1 (b1 @ (boolean it))%I
+                  v2 (b2 @ (boolean it))%I
+                  (EqOp i32) (IntOp it) (IntOp it) :=
+    λ T, i2p (type_relop_boolean it v1 b1 v2 b2 T (eqb b1 b2) _ _).
+  Next Obligation. done. Qed.
+  Global Program Instance type_ne_boolean_inst it v1 b1 v2 b2:
+    TypedBinOpVal v1 (b1 @ (boolean it))%I
+                  v2 (b2 @ (boolean it))%I
+                  (NeOp i32) (IntOp it) (IntOp it) :=
+    λ T, i2p (type_relop_boolean it v1 b1 v2 b2 T (negb (eqb b1 b2)) _ _).
+  Next Obligation. done. Qed.
+
+  (* TODO: replace this with a typed_cas once it is refactored to take E as an argument. *)
+  Lemma wp_cas_suc_boolean it b1 b2 bd l1 l2 vd Φ E:
+    (bytes_per_int it ≤ bytes_per_addr)%nat →
+    b1 = b2 →
+    l1 ◁ₗ b1 @ boolean it -∗
+    l2 ◁ₗ b2 @ boolean it -∗
+    vd ◁ᵥ bd @ boolean it -∗
+    ▷ (l1 ◁ₗ bd @ boolean it -∗ l2 ◁ₗ b2 @ boolean it -∗ Φ (val_of_bool true)) -∗
+    wp NotStuck E (CAS (IntOp it) (Val l1) (Val l2) (Val vd)) Φ.
+  Proof.
+    iIntros (? ->) "(%v1&%n1&%&%&%&Hl1) (%v2&%n2&%&%&%&Hl2) (%n&%&%) HΦ/=".
+    iApply (wp_cas_suc with "Hl1 Hl2") => //.
+    { by apply val_to_of_loc. }
+    { by apply val_to_of_loc. }
+    { by eapply val_to_Z_length. }
+    { simpl in *. by simplify_eq. }
+    iIntros "!# Hl1 Hl2". iApply ("HΦ" with "[Hl1] [Hl2]"); iExists _, _; by iFrame.
+  Qed.
+
+  Lemma wp_cas_fail_boolean it b1 b2 bd l1 l2 vd Φ E:
+    (bytes_per_int it ≤ bytes_per_addr)%nat →
+    b1 ≠ b2 →
+    l1 ◁ₗ b1 @ boolean it -∗ l2 ◁ₗ b2 @ boolean it -∗ vd ◁ᵥ bd @ boolean it -∗
+    ▷ (l1 ◁ₗ b1 @ boolean it -∗ l2 ◁ₗ b1 @ boolean it -∗ Φ (val_of_bool false)) -∗
+    wp NotStuck E (CAS (IntOp it) (Val l1) (Val l2) (Val vd)) Φ.
+  Proof.
+    iIntros (??) "(%v1&%n1&%&%&%&Hl1) (%v2&%n2&%&%&%&Hl2) (%n&%&%) HΦ/=".
+    iApply (wp_cas_fail with "Hl1 Hl2") => //.
+    { by apply val_to_of_loc. }
+    { by apply val_to_of_loc. }
+    { by eapply val_to_Z_length. }
+    { simpl in *. simplify_eq. by destruct b1, b2. }
+    iIntros "!# Hl1 Hl2". iApply ("HΦ" with "[Hl1] [Hl2]"); iExists _, _; by iFrame.
+  Qed.
+
+  Lemma type_val_boolean b T:
+    (T (t2mt (b @ boolean bool_it))) -∗ typed_value (val_of_bool b) T.
+  Proof.
+    iIntros "HT". iExists _. iFrame.
+    iExists (Z_of_bool b). destruct b; eauto.
+  Qed.
+  Global Instance type_val_boolean_inst b : TypedValue (val_of_bool b) :=
+    λ T, i2p (type_val_boolean b T).
+
+  Lemma type_cast_boolean b it1 it2 v T:
+    (∀ v, T v (t2mt (b @ boolean it2))) -∗
+    typed_un_op v (v ◁ᵥ b @ boolean it1)%I (CastOp (IntOp it2)) (IntOp it1) T.
+  Proof.
+    iIntros "HT (%n&%Hv&%Hb) %Φ HΦ". move: Hb => /= ?. subst n.
+    have [??] := val_of_Z_bool_is_Some (val_to_byte_prov v) it2 b.
+    iApply wp_cast_int => //. iApply ("HΦ" with "[] HT") => //.
+    iExists _. iSplit; last done. iPureIntro. by eapply val_to_of_Z.
+  Qed.
+  Global Instance type_cast_bool_inst b it1 it2 v:
+    TypedUnOpVal v (b @ boolean it1)%I (CastOp (IntOp it2)) (IntOp it1) :=
+    λ T, i2p (type_cast_boolean b it1 it2 v T).
+
+End boolean.
+Typeclasses Opaque generic_boolean_inner_type.
+
+Notation "'if' p " := (DestructHintIfBool p) (at level 100, only printing).

theories/typing/int.v

 From refinedc.typing Require Export type.
-From refinedc.typing Require Import programs.
+From refinedc.typing Require Import programs boolean.
 Set Default Proof Using "Type".
 
 Section int.
@@ -81,40 +81,6 @@ End int.
 (* Typeclasses Opaque int. *)
 Notation "int< it >" := (int it) (only printing, format "'int<' it '>'") : printing_sugar.
 
-(* TODO: move this to an extra file? *)
-Section boolean.
-  Context `{!typeG Σ}.
-
-  (* Separate definition such that we can make it typeclasses opaque later. *)
-  Program Definition boolean_inner_type (it : int_type) (b : bool) : type :=
-    (Z_of_bool b) @ int it.
-
-  Program Definition boolean (it : int_type) : rtype := {|
-    rty_type := bool;
-    rty := boolean_inner_type it;
-  |}.
-
-  Global Program Instance rmovable_boolean it : RMovable (boolean it) := {|
-    rmovable b := (rmovable (int it)) (Z_of_bool b);
-  |}.
-
-  Global Program Instance boolean_copyable x it : Copyable (x @ boolean it).
-  Next Obligation. rewrite/with_refinement/=/boolean_inner_type => ???????. by apply: copy_shr_acc. Qed.
-
-  Lemma boolean_own_val_eq v b it:
-    (v ◁ᵥ b @ boolean it)%I ≡ ⌜val_to_Z v it = Some (Z_of_bool b)⌝%I.
-  Proof. done. Qed.
-
-  Global Instance alloc_alive_bool b it β: AllocAlive (b @ boolean it) β True.
-  Proof. apply _. Qed.
-
-  Global Instance boolean_timeless l b it:
-    Timeless (l ◁ₗ b @ boolean it)%I.
-  Proof. apply _. Qed.
-
-End boolean.
-Notation "boolean< it >" := (boolean it) (only printing, format "'boolean<' it '>'") : printing_sugar.
-
 Section programs.
   Context `{!typeG Σ}.
 
@@ -152,10 +118,10 @@ Section programs.
     1-2: iPureIntro; by apply: val_to_Z_in_range.
     have [v Hv]:= val_of_Z_bool_is_Some None i32 b.
     iApply (wp_binop_det_pure (i2v (Z_of_bool b) i32)).
-    { rewrite /i2v Hv /=.
-      split; last (move => ->; by econstructor).
+    { rewrite /i2v Hv /=. split; last (move => ->; by econstructor).
       destruct op => //; inversion 1; by simplify_eq. }
-    iIntros "!>". iApply "HΦ" => //. by destruct b.
+    iIntros "!>". iApply "HΦ" => //.
+    iExists (Z_of_bool b). destruct b; eauto.
   Qed.
 
   Global Program Instance type_eq_int_int_inst it v1 n1 v2 n2:
@@ -461,137 +427,52 @@ Section programs.
     iIntros "!# Hl1 Hl2". iApply ("HΦ" with "[Hl1] [Hl2]"); iExists _; by iFrame.
   Qed.
 
-  (*** bool *)
-  Lemma type_val_bool' b:
-    ⊢ (val_of_bool b) ◁ᵥ (b @ boolean bool_it).
-  Proof. iIntros. by destruct b. Qed.
-  Lemma type_val_bool b T:
-    (T (t2mt (b @ boolean bool_it))) -∗ typed_value (val_of_bool b) T.
-  Proof. iIntros "HT". iExists _. iFrame. iApply type_val_bool'. Qed.
-  Global Instance type_val_bool_inst b : TypedValue (val_of_bool b) :=
-    λ T, i2p (type_val_bool b T).
-
-  Inductive destruct_hint_if_bool :=
-  | DestructHintIfBool (b : bool).
-
-  Lemma type_relop_bool_bool it v1 b1 v2 b2 T b op:
-    match op with
-    | EqOp rit => Some (eqb b1 b2, rit)
-    | NeOp rit => Some (negb (eqb b1 b2), rit)
-    | _ => None
-    end = Some (b, i32) →
-    (T (i2v (Z_of_bool b) i32) (t2mt (b @ boolean i32))) -∗
-      typed_bin_op v1 (v1 ◁ᵥ b1 @ boolean it) v2 (v2 ◁ᵥ b2 @ boolean it) op (IntOp it) (IntOp it) T.
-  Proof.
-    iIntros "%Hop HT %Hv1 %Hv2 %Φ HΦ".
-    have [v Hv]:= val_of_Z_bool_is_Some None i32 b.
-    iApply (wp_binop_det_pure (i2v (Z_of_bool b) i32)).
-    { rewrite /i2v Hv /=.
-      destruct op, b1, b2; simplify_eq.
-      all: split; [ inversion 1; simplify_eq/=; done | move => -> ]; simplify_eq/=.
-      all: econstructor => //; by case_bool_decide. }
-    iApply "HΦ"; last done. iPureIntro. by destruct b.
-  Qed.
-
-  Global Program Instance type_eq_bool_bool_inst it v1 b1 v2 b2:
-    TypedBinOpVal v1 (b1 @ (boolean it))%I v2 (b2 @ (boolean it))%I (EqOp i32) (IntOp it) (IntOp it) := λ T, i2p (type_relop_bool_bool it v1 b1 v2 b2 T (eqb b1 b2) _ _).
-  Next Obligation. done. Qed.
-  Global Program Instance type_ne_bool_bool_inst it v1 b1 v2 b2:
-    TypedBinOpVal v1 (b1 @ (boolean it))%I v2 (b2 @ (boolean it))%I (NeOp i32) (IntOp it) (IntOp it) := λ T, i2p (type_relop_bool_bool it v1 b1 v2 b2 T (negb (eqb b1 b2)) _ _).
-  Next Obligation. done. Qed.
-
-  Lemma type_if_bool it (b : bool) v T1 T2 :
-    destruct_hint (DHintDestruct _ b) (DestructHintIfBool b)
-    (if b then T1 else T2) -∗
-    typed_if (IntOp it) v (v ◁ᵥ b @ boolean it) T1 T2.
-  Proof.
-    unfold destruct_hint. iIntros "Hs %Hb".
-    iExists _. iSplit; first done. by destruct b.
-  Qed.
-  Global Instance type_if_bool_inst it b v : TypedIf (IntOp it) v (v ◁ᵥ b @ boolean it)%I :=
-    λ T1 T2, i2p (type_if_bool it b v T1 T2).
-
-  Lemma type_assert_bool it (b : bool) s Q fn ls R v :
-    (⌜b⌝ ∗ typed_stmt s fn ls R Q) -∗
-    typed_assert (IntOp it) v (v ◁ᵥ b @ boolean it) s fn ls R Q.
-  Proof.
-    iIntros "[% Hs] %Hb". iExists _. iFrame "Hs".
-    iSplit; first done. by destruct b.
-  Qed.
-  Global Instance type_assert_bool_inst it b v : TypedAssert (IntOp it) v (v ◁ᵥ b @ boolean it)%I :=
-    λ s fn ls R Q, i2p (type_assert_bool _ _ _ _ _ _ _ _).
-