pub struct VisibilityStack<'a> { /* private fields */ }Expand description
Decl visibility resolved across the overlay frames walked so far, innermost frame first.
Name lookups walk the active overlays from the innermost one outwards. A decl is visible
unless one of the frames walked so far has an explicit entry hiding it, and the innermost
frame with an entry for the decl wins. This borrows each frame’s Visibility instead of
merging the maps: merging copied every entry of every frame on every lookup, which made
find_decl (called for every command word the parser sees) cost as much as the maps were
large.
Implementations§
Source§impl<'a> VisibilityStack<'a>
impl<'a> VisibilityStack<'a>
Sourcepub fn push(&mut self, visibility: &'a Visibility)
pub fn push(&mut self, visibility: &'a Visibility)
Add the visibility of the next (outer) frame. Frames pushed earlier take precedence.
A frame that hides nothing can never answer a lookup, so it is not recorded; this keeps the common lookup (no hidden declarations anywhere) free of allocation.
Sourcepub fn is_decl_id_visible(&self, decl_id: &DeclId) -> bool
pub fn is_decl_id_visible(&self, decl_id: &DeclId) -> bool
Whether decl_id is visible given the frames pushed so far.
Trait Implementations§
Source§impl<'a> Debug for VisibilityStack<'a>
impl<'a> Debug for VisibilityStack<'a>
Auto Trait Implementations§
impl<'a> Freeze for VisibilityStack<'a>
impl<'a> RefUnwindSafe for VisibilityStack<'a>
impl<'a> Send for VisibilityStack<'a>
impl<'a> Sync for VisibilityStack<'a>
impl<'a> Unpin for VisibilityStack<'a>
impl<'a> UnsafeUnpin for VisibilityStack<'a>
impl<'a> UnwindSafe for VisibilityStack<'a>
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