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use option<PlaceRef<'tcx>> to clean up mir code a little

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This commit is contained in:
Henry Boisdequin 2021-02-14 14:39:24 +05:30
parent 1279b3b923
commit eace240ebe
2 changed files with 12 additions and 13 deletions
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6
compiler/rustc_middle/src/mir/mod.rs
View File

@ -962,8 +962,7 @@ pub fn can_be_made_mutable(&self) -> bool {
opt_ty_info: _,
opt_match_place: _,
pat_span: _,
})
| BindingForm::ImplicitSelf(ImplicitSelfKind::Imm),
}) | BindingForm::ImplicitSelf(ImplicitSelfKind::Imm),
)))
)
}
@ -980,8 +979,7 @@ pub fn is_nonref_binding(&self) -> bool {
opt_ty_info: _,
opt_match_place: _,
pat_span: _,
})
| BindingForm::ImplicitSelf(_),
}) | BindingForm::ImplicitSelf(_),
)))
)
}

19
compiler/rustc_mir/src/transform/check_consts/validation.rs
View File

@ -492,7 +492,7 @@ fn visit_rvalue(&mut self, rvalue: &Rvalue<'tcx>, location: Location) {
// Special-case reborrows to be more like a copy of a reference.
match *rvalue {
Rvalue::Ref(_, kind, place) => {
if let Some(reborrowed_proj) = place_as_reborrow(self.tcx, self.body, place) {
if let Some(place_ref) = place_as_reborrow(self.tcx, self.body, place) {
let ctx = match kind {
BorrowKind::Shared => {
PlaceContext::NonMutatingUse(NonMutatingUseContext::SharedBorrow)
@ -508,12 +508,12 @@ fn visit_rvalue(&mut self, rvalue: &Rvalue<'tcx>, location: Location) {
}
};
self.visit_local(&place.local, ctx, location);
self.visit_projection(place.local, reborrowed_proj, ctx, location);
self.visit_projection(place.local, place_ref.projection, ctx, location);
return;
}
}
Rvalue::AddressOf(mutbl, place) => {
if let Some(reborrowed_proj) = place_as_reborrow(self.tcx, self.body, place) {
if let Some(place_ref) = place_as_reborrow(self.tcx, self.body, place) {
let ctx = match mutbl {
Mutability::Not => {
PlaceContext::NonMutatingUse(NonMutatingUseContext::AddressOf)
@ -521,7 +521,7 @@ fn visit_rvalue(&mut self, rvalue: &Rvalue<'tcx>, location: Location) {
Mutability::Mut => PlaceContext::MutatingUse(MutatingUseContext::AddressOf),
};
self.visit_local(&place.local, ctx, location);
self.visit_projection(place.local, reborrowed_proj, ctx, location);
self.visit_projection(place.local, place_ref.projection, ctx, location);
return;
}
}
@ -1016,7 +1016,7 @@ fn place_as_reborrow(
tcx: TyCtxt<'tcx>,
body: &Body<'tcx>,
place: Place<'tcx>,
) -> Option<&'a [PlaceElem<'tcx>]> {
) -> Option<PlaceRef<'tcx>> {
match place.as_ref().last_projection() {
Some((place_base, ProjectionElem::Deref)) => {
// A borrow of a `static` also looks like `&(*_1)` in the MIR, but `_1` is a `const`
@ -1025,13 +1025,14 @@ fn place_as_reborrow(
None
} else {
// Ensure the type being derefed is a reference and not a raw pointer.
//
// This is sufficient to prevent an access to a `static mut` from being marked as a
// reborrow, even if the check above were to disappear.
let inner_ty = place_base.ty(body, tcx).ty;
match inner_ty.kind() {
ty::Ref(..) => Some(place_base.projection),
_ => None,
if let ty::Ref(..) = inner_ty.kind() {
return Some(place_base);
} else {
return None;
}
}
}