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allow refs in our constant handling

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This commit is contained in:
Andre Bogus 2020-10-09 00:49:27 +02:00
parent 265e4841b7
commit 26e4de9557
3 changed files with 20 additions and 7 deletions
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10
clippy_lints/src/consts.rs
View file

@ -40,6 +40,8 @@ pub enum Constant {
Tuple(Vec<Constant>),
/// A raw pointer.
RawPtr(u128),
/// A reference
Ref(Box<Constant>),
/// A literal with syntax error.
Err(Symbol),
}
@ -66,6 +68,7 @@ impl PartialEq for Constant {
(&Self::Bool(l), &Self::Bool(r)) => l == r,
(&Self::Vec(ref l), &Self::Vec(ref r)) | (&Self::Tuple(ref l), &Self::Tuple(ref r)) => l == r,
(&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => ls == rs && lv == rv,
(&Self::Ref(ref lb), &Self::Ref(ref rb)) => *lb == *rb,
// TODO: are there inter-type equalities?
_ => false,
}
@ -110,6 +113,9 @@ impl Hash for Constant {
Self::RawPtr(u) => {
u.hash(state);
},
Self::Ref(ref r) => {
r.hash(state);
},
Self::Err(ref s) => {
s.hash(state);
},
@ -144,6 +150,7 @@ impl Constant {
x => x,
}
},
(&Self::Ref(ref lb), &Self::Ref(ref rb)) => Self::partial_cmp(tcx, cmp_type, lb, rb),
// TODO: are there any useful inter-type orderings?
_ => None,
}
@ -239,7 +246,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
ExprKind::Unary(op, ref operand) => self.expr(operand).and_then(|o| match op {
UnOp::UnNot => self.constant_not(&o, self.typeck_results.expr_ty(e)),
UnOp::UnNeg => self.constant_negate(&o, self.typeck_results.expr_ty(e)),
UnOp::UnDeref => Some(o),
UnOp::UnDeref => Some(if let Constant::Ref(r) = o { *r } else { o }),
}),
ExprKind::Binary(op, ref left, ref right) => self.binop(op, left, right),
ExprKind::Call(ref callee, ref args) => {
@ -269,6 +276,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
}
},
ExprKind::Index(ref arr, ref index) => self.index(arr, index),
ExprKind::AddrOf(_, _, ref inner) => self.expr(inner).map(|r| Constant::Ref(Box::new(r))),
// TODO: add other expressions.
_ => None,
}

5
tests/ui/float_cmp.rs
View file

@ -2,6 +2,7 @@
#![allow(
unused,
clippy::no_effect,
clippy::op_ref,
clippy::unnecessary_operation,
clippy::cast_lossless,
clippy::many_single_char_names
@ -116,4 +117,8 @@ fn main() {
1.23f64.signum() != x64.signum();
1.23f64.signum() != -(x64.signum());
1.23f64.signum() != 3.21f64.signum();
// the comparison should also look through references
&0.0 == &ZERO;
&&&&0.0 == &&&&ZERO;
}

12
tests/ui/float_cmp.stderr
View file

@ -1,5 +1,5 @@
error: strict comparison of `f32` or `f64`
--> $DIR/float_cmp.rs:65:5
--> $DIR/float_cmp.rs:66:5
|
LL | ONE as f64 != 2.0;
| ^^^^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(ONE as f64 - 2.0).abs() > error_margin`
@ -8,7 +8,7 @@ LL | ONE as f64 != 2.0;
= note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
error: strict comparison of `f32` or `f64`
--> $DIR/float_cmp.rs:70:5
--> $DIR/float_cmp.rs:71:5
|
LL | x == 1.0;
| ^^^^^^^^ help: consider comparing them within some margin of error: `(x - 1.0).abs() < error_margin`
@ -16,7 +16,7 @@ LL | x == 1.0;
= note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
error: strict comparison of `f32` or `f64`
--> $DIR/float_cmp.rs:73:5
--> $DIR/float_cmp.rs:74:5
|
LL | twice(x) != twice(ONE as f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(twice(x) - twice(ONE as f64)).abs() > error_margin`
@ -24,7 +24,7 @@ LL | twice(x) != twice(ONE as f64);
= note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
error: strict comparison of `f32` or `f64`
--> $DIR/float_cmp.rs:93:5
--> $DIR/float_cmp.rs:94:5
|
LL | NON_ZERO_ARRAY[i] == NON_ZERO_ARRAY[j];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(NON_ZERO_ARRAY[i] - NON_ZERO_ARRAY[j]).abs() < error_margin`
@ -32,7 +32,7 @@ LL | NON_ZERO_ARRAY[i] == NON_ZERO_ARRAY[j];
= note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
error: strict comparison of `f32` or `f64` arrays
--> $DIR/float_cmp.rs:98:5
--> $DIR/float_cmp.rs:99:5
|
LL | a1 == a2;
| ^^^^^^^^
@ -40,7 +40,7 @@ LL | a1 == a2;
= note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
error: strict comparison of `f32` or `f64`
--> $DIR/float_cmp.rs:99:5
--> $DIR/float_cmp.rs:100:5
|
LL | a1[0] == a2[0];
| ^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(a1[0] - a2[0]).abs() < error_margin`