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document Borrows dataflow analysis

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Rémy Rakic 2023-06-30 12:21:50 +00:00
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compiler/rustc_borrowck/src/dataflow.rs
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@ -333,6 +333,13 @@ impl<'tcx> rustc_mir_dataflow::AnalysisDomain<'tcx> for Borrows<'_, 'tcx> {
} }
} }
/// Forward dataflow computation of the set of borrows that are in scope at a particular location.
/// - we gen the introduced loans
/// - we kill loans on locals going out of (regular) scope
/// - we kill the loans going out of their region's NLL scope: in NLL terms, the frontier where a
/// region stops containing the CFG points reachable from the issuing location.
/// - we also kill loans of conflicting places when overwriting a shared path: e.g. borrows of
/// `a.b.c` when `a` is overwritten.
impl<'tcx> rustc_mir_dataflow::GenKillAnalysis<'tcx> for Borrows<'_, 'tcx> { impl<'tcx> rustc_mir_dataflow::GenKillAnalysis<'tcx> for Borrows<'_, 'tcx> {
type Idx = BorrowIndex; type Idx = BorrowIndex;