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make more matches exhaustive

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This commit is contained in:
Ralf Jung 2020-12-28 23:29:16 +01:00
parent c177e68015
commit 4a90a58c34
1 changed files with 41 additions and 20 deletions
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61
compiler/rustc_mir/src/transform/promote_consts.rs
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@ -583,11 +583,15 @@ impl<'tcx> Validator<'_, 'tcx> {
fn validate_rvalue(&self, rvalue: &Rvalue<'tcx>) -> Result<(), Unpromotable> {
match rvalue {
Rvalue::Use(operand) | Rvalue::Repeat(operand, _) | Rvalue::UnaryOp(_, operand) => {
Rvalue::Use(operand)
| Rvalue::Repeat(operand, _)
| Rvalue::UnaryOp(UnOp::Not | UnOp::Neg, operand) => {
self.validate_operand(operand)?;
}
Rvalue::Discriminant(place) | Rvalue::Len(place) => self.validate_place(place.as_ref())?,
Rvalue::Discriminant(place) | Rvalue::Len(place) => {
self.validate_place(place.as_ref())?
}
Rvalue::ThreadLocalRef(_) => return Err(Unpromotable),
@ -606,35 +610,52 @@ impl<'tcx> Validator<'_, 'tcx> {
self.validate_operand(operand)?;
}
Rvalue::BinaryOp(op, lhs, rhs)
| Rvalue::CheckedBinaryOp(op, lhs, rhs) => {
Rvalue::BinaryOp(op, lhs, rhs) | Rvalue::CheckedBinaryOp(op, lhs, rhs) => {
let op = *op;
if let ty::RawPtr(_) | ty::FnPtr(..) = lhs.ty(self.body, self.tcx).kind() {
assert!(
op == BinOp::Eq
|| op == BinOp::Ne
|| op == BinOp::Le
|| op == BinOp::Lt
|| op == BinOp::Ge
|| op == BinOp::Gt
|| op == BinOp::Offset
);
// raw pointer operations are not allowed inside consts and thus not promotable
assert!(matches!(
op,
BinOp::Eq
| BinOp::Ne
| BinOp::Le
| BinOp::Lt
| BinOp::Ge
| BinOp::Gt
| BinOp::Offset
));
return Err(Unpromotable);
}
// FIXME: reject operations that can fail -- namely, division and modulo.
match op {
// FIXME: reject operations that can fail -- namely, division and modulo.
BinOp::Eq
| BinOp::Ne
| BinOp::Le
| BinOp::Lt
| BinOp::Ge
| BinOp::Gt
| BinOp::Offset
| BinOp::Add
| BinOp::Sub
| BinOp::Mul
| BinOp::Div
| BinOp::Rem
| BinOp::BitXor
| BinOp::BitAnd
| BinOp::BitOr
| BinOp::Shl
| BinOp::Shr => {}
}
self.validate_operand(lhs)?;
self.validate_operand(rhs)?;
}
Rvalue::NullaryOp(op, _) => {
if matches!(op, NullOp::Box) {
return Err(Unpromotable);
}
}
Rvalue::NullaryOp(op, _) => match op {
NullOp::Box => return Err(Unpromotable),
NullOp::SizeOf => {}
},
Rvalue::AddressOf(_, place) => {
// We accept `&raw *`, i.e., raw reborrows -- creating a raw pointer is