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Implement more precise binary op return type prediction

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This commit is contained in:
Lukas Wirth 2021-04-10 16:56:32 +02:00
parent e357b6bb36
commit 252eb78dc3
2 changed files with 51 additions and 17 deletions
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58
crates/hir_ty/src/op.rs
View File

@ -9,21 +9,55 @@ pub(super) fn binary_op_return_ty(op: BinaryOp, lhs_ty: Ty, rhs_ty: Ty) -> Ty {
BinaryOp::LogicOp(_) | BinaryOp::CmpOp(_) => TyKind::Scalar(Scalar::Bool).intern(&Interner),
BinaryOp::Assignment { .. } => TyBuilder::unit(),
BinaryOp::ArithOp(ArithOp::Shl) | BinaryOp::ArithOp(ArithOp::Shr) => {
match lhs_ty.kind(&Interner) {
// all integer combinations are valid here
if matches!(
lhs_ty.kind(&Interner),
TyKind::Scalar(Scalar::Int(_))
| TyKind::Scalar(Scalar::Uint(_))
| TyKind::Scalar(Scalar::Float(_)) => lhs_ty,
TyKind::InferenceVar(_, TyVariableKind::Integer)
| TyKind::InferenceVar(_, TyVariableKind::Float) => lhs_ty,
_ => TyKind::Error.intern(&Interner),
| TyKind::Scalar(Scalar::Uint(_))
| TyKind::InferenceVar(_, TyVariableKind::Integer)
) && matches!(
rhs_ty.kind(&Interner),
TyKind::Scalar(Scalar::Int(_))
| TyKind::Scalar(Scalar::Uint(_))
| TyKind::InferenceVar(_, TyVariableKind::Integer)
) {
lhs_ty
} else {
TyKind::Error.intern(&Interner)
}
}
BinaryOp::ArithOp(_) => match rhs_ty.kind(&Interner) {
TyKind::Scalar(Scalar::Int(_))
| TyKind::Scalar(Scalar::Uint(_))
| TyKind::Scalar(Scalar::Float(_)) => rhs_ty,
TyKind::InferenceVar(_, TyVariableKind::Integer)
| TyKind::InferenceVar(_, TyVariableKind::Float) => rhs_ty,
BinaryOp::ArithOp(_) => match (lhs_ty.kind(&Interner), rhs_ty.kind(&Interner)) {
// (int, int) | (uint, uint) | (float, float)
(TyKind::Scalar(Scalar::Int(_)), TyKind::Scalar(Scalar::Int(_)))
| (TyKind::Scalar(Scalar::Uint(_)), TyKind::Scalar(Scalar::Uint(_)))
| (TyKind::Scalar(Scalar::Float(_)), TyKind::Scalar(Scalar::Float(_))) => rhs_ty,
// ({int}, int) | ({int}, uint)
(TyKind::InferenceVar(_, TyVariableKind::Integer), TyKind::Scalar(Scalar::Int(_)))
| (TyKind::InferenceVar(_, TyVariableKind::Integer), TyKind::Scalar(Scalar::Uint(_))) => {
rhs_ty
}
// (int, {int}) | (uint, {int})
(TyKind::Scalar(Scalar::Int(_)), TyKind::InferenceVar(_, TyVariableKind::Integer))
| (TyKind::Scalar(Scalar::Uint(_)), TyKind::InferenceVar(_, TyVariableKind::Integer)) => {
lhs_ty
}
// ({float} | float)
(TyKind::InferenceVar(_, TyVariableKind::Float), TyKind::Scalar(Scalar::Float(_))) => {
rhs_ty
}
// (float, {float})
(TyKind::Scalar(Scalar::Float(_)), TyKind::InferenceVar(_, TyVariableKind::Float)) => {
lhs_ty
}
// ({int}, {int}) | ({float}, {float})
(
TyKind::InferenceVar(_, TyVariableKind::Integer),
TyKind::InferenceVar(_, TyVariableKind::Integer),
)
| (
TyKind::InferenceVar(_, TyVariableKind::Float),
TyKind::InferenceVar(_, TyVariableKind::Float),
) => rhs_ty,
_ => TyKind::Error.intern(&Interner),
},
}

10
crates/hir_ty/src/tests/traits.rs
View File

@ -1936,14 +1936,14 @@ fn closure_2() {
84..85 'f': F
84..88 'f(1)': {unknown}
86..87 '1': i32
98..99 'g': |u64| -> i32
102..111 '|v| v + 1': |u64| -> i32
98..99 'g': |u64| -> {unknown}
102..111 '|v| v + 1': |u64| -> {unknown}
103..104 'v': u64
106..107 'v': u64
106..111 'v + 1': i32
106..111 'v + 1': {unknown}
110..111 '1': i32
117..118 'g': |u64| -> i32
117..124 'g(1u64)': i32
117..118 'g': |u64| -> {unknown}
117..124 'g(1u64)': {unknown}
119..123 '1u64': u64
134..135 'h': |u128| -> u128
138..151 '|v| 1u128 + v': |u128| -> u128