Struct FrameState

pub struct FrameState {
    protected_tags: SmallVec<[(AllocId, BorTag); 2]>,
}

Per-call-stack-frame data for borrow tracking

Fields

protected_tags: SmallVec<[(AllocId, BorTag); 2]>

If this frame is protecting any tags, they are listed here. We use this list to do incremental updates of the global list of protected tags stored in the stacked_borrows::GlobalState upon function return, and if we attempt to pop a protected tag, to identify which call is responsible for protecting the tag. See Stack::item_invalidated for more explanation. Tree Borrows also needs to know which allocation these tags belong to so that it can perform a read through them immediately before the frame gets popped.

This will contain one tag per reference passed to the function, so a size of 2 is enough for the vast majority of functions.

Trait Implementations

impl Debug for FrameState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl VisitProvenance for FrameState

fn visit_provenance(&self, visit: &mut VisitWith<'_>)

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 48 bytes