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Make find iterate instead of recurse #61103

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May 25, 2019
Merged

Make find iterate instead of recurse #61103

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27 changes: 14 additions & 13 deletions src/librustc_mir/dataflow/move_paths/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -241,21 +241,22 @@ impl MovePathLookup {
// unknown place, but will rather return the nearest available
// parent.
pub fn find(&self, place: &Place<'tcx>) -> LookupResult {
match *place {
Place::Base(PlaceBase::Local(local)) => LookupResult::Exact(self.locals[local]),
Place::Base(PlaceBase::Static(..)) => LookupResult::Parent(None),
Place::Projection(ref proj) => {
match self.find(&proj.base) {
LookupResult::Exact(base_path) => {
match self.projections.get(&(base_path, proj.elem.lift())) {
Some(&subpath) => LookupResult::Exact(subpath),
None => LookupResult::Parent(Some(base_path))
}
}
inexact => inexact
place.iterate(|place_base, place_projection| {
let mut result = match place_base {
PlaceBase::Local(local) => self.locals[*local],
PlaceBase::Static(..) => return LookupResult::Parent(None),
};

for proj in place_projection {
if let Some(&subpath) = self.projections.get(&(result, proj.elem.lift())) {
result = subpath;
} else {
return LookupResult::Parent(Some(result));
}
}
}

LookupResult::Exact(result)
})
}

pub fn find_local(&self, local: Local) -> MovePathIndex {
Expand Down