bjoernager/rust
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cleanup misinformation regarding has_deref

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This commit is contained in:
ouz-a 2023-08-05 12:02:39 +03:00
parent 5cbfee5455
commit 6df546281b
7 changed files with 23 additions and 17 deletions
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28
compiler/rustc_middle/src/mir/mod.rs
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@ -1592,14 +1592,13 @@ impl<'tcx> Place<'tcx> {
self.projection.iter().any(|elem| elem.is_indirect())
}
/// If MirPhase >= Derefered and if projection contains Deref,
/// It's guaranteed to be in the first place
pub fn has_deref(&self) -> bool {
// To make sure this is not accidentally used in wrong mir phase
debug_assert!(
self.projection.is_empty() || !self.projection[1..].contains(&PlaceElem::Deref)
);
self.projection.first() == Some(&PlaceElem::Deref)
/// Returns `true` if this `Place`'s first projection is `Deref`.
///
/// This is useful because for MIR phases `AnalysisPhase::PostCleanup` and later,
/// `Deref` projections can only occur as the first projection. In that case this method
/// is equivalent to `is_indirect`, but faster.
pub fn is_indirect_first_projection(&self) -> bool {
self.as_ref().is_indirect_first_projection()
}
/// Finds the innermost `Local` from this `Place`, *if* it is either a local itself or
@ -1672,9 +1671,16 @@ impl<'tcx> PlaceRef<'tcx> {
self.projection.iter().any(|elem| elem.is_indirect())
}
/// If MirPhase >= Derefered and if projection contains Deref,
/// It's guaranteed to be in the first place
pub fn has_deref(&self) -> bool {
/// Returns `true` if this `Place`'s first projection is `Deref`.
///
/// This is useful because for MIR phases `AnalysisPhase::PostCleanup` and later,
/// `Deref` projections can only occur as the first projection. In that case this method
/// is equivalent to `is_indirect`, but faster.
pub fn is_indirect_first_projection(&self) -> bool {
// To make sure this is not accidentally used in wrong mir phase
debug_assert!(
self.projection.is_empty() || !self.projection[1..].contains(&PlaceElem::Deref)
);
self.projection.first() == Some(&PlaceElem::Deref)
}