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rustc_mir: promote borrows' underlying temps, and project at runtime.

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Eduard-Mihai Burtescu 2018-05-10 12:39:50 +03:00
parent d79dee0b62
commit 4fec5ef81a
1 changed files with 12 additions and 0 deletions
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12
src/librustc_mir/transform/promote_consts.rs
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@ -309,6 +309,18 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
let ref mut statement = blocks[loc.block].statements[loc.statement_index];
match statement.kind {
StatementKind::Assign(_, Rvalue::Ref(r, bk, ref mut place)) => {
// Find the underlying local for this (necessarilly interior) borrow.
// HACK(eddyb) using a recursive function because of mutable borrows.
fn interior_base<'a, 'tcx>(place: &'a mut Place<'tcx>)
-> &'a mut Place<'tcx> {
if let Place::Projection(ref mut proj) = *place {
assert_ne!(proj.elem, ProjectionElem::Deref);
return interior_base(&mut proj.base);
}
place
}
let place = interior_base(place);
let ty = place.ty(local_decls, self.tcx).to_ty(self.tcx);
let ref_ty = self.tcx.mk_ref(r,
ty::TypeAndMut {