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prove: cursor_mut_at at mm::frame::linked_list #454

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prove: cursor_mut_at at mm::frame::linked_list #454

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18 changes: 12 additions & 6 deletions ostd/src/mm/frame/linked_list.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -427,25 +427,31 @@ impl<M: AnyFrameMeta + Repr<MetaSlotSmall>> LinkedList<M> {
-> cursor_owner: Tracked<Option<CursorOwner<M>>>,
requires
old(regions).inv(),
has_safe_slot(frame) ==> old(regions).slots.contains_key(frame_to_index(frame)),
has_safe_slot(frame) ==> old(regions).slot_owners[frame_to_index(frame)].inner_perms.in_list.is_for(
old(regions).slots[frame_to_index(frame)].mem_contents().value().in_list,
),
ensures
// has_safe_slot(frame) && owner.list_id != 0 ==> r is Some,
!has_safe_slot(frame) ==> r is None,
)]
#[verifier::external_body]
pub fn cursor_mut_at(&mut self, frame: Paddr) -> Option<CursorMut<'_, M>>
{
let tracked mut slot_own = regions.slot_owners.tracked_remove(frame_to_index(frame));
let tracked mut inner_perms = slot_own.take_inner_perms();

if let Ok(slot_ptr) = get_slot(frame) {
let slot = slot_ptr.borrow(Tracked(&regions.slots[frame_to_index(frame)]));
proof {
regions.inv_implies_correct_addr(frame);
}
let tracked mut slot_own = regions.slot_owners.tracked_remove(frame_to_index(frame));
let tracked mut inner_perms = slot_own.take_inner_perms();
let tracked slot_perm = regions.slots.tracked_borrow(frame_to_index(frame));
let slot = slot_ptr.borrow(Tracked(slot_perm));

let in_list = slot.in_list.load(Tracked(&mut inner_perms.in_list));

let contains = in_list == #[verus_spec(with Tracked(&owner))]
self.lazy_get_id();

#[verus_spec(with Tracked(&regions.slots[frame_to_index(frame)]))]
#[verus_spec(with Tracked(slot_perm))]
let meta_ptr = slot.as_meta_ptr::<Link<M>>();

if contains {
Expand Down