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Original file line number | Diff line number | Diff line change |
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use clippy_utils::{ | ||
consts::constant, diagnostics::span_lint_and_sugg, is_from_proc_macro, path_to_local, source::snippet_opt, | ||
}; | ||
use rustc_errors::Applicability; | ||
use rustc_hir::{BinOpKind, Expr, ExprKind}; | ||
use rustc_lint::{LateContext, LateLintPass, LintContext}; | ||
use rustc_middle::lint::in_external_macro; | ||
use rustc_session::{declare_lint_pass, declare_tool_lint}; | ||
|
||
declare_clippy_lint! { | ||
/// ### What it does | ||
/// Checks for `x == <float>::INFINITY || x == <float>::NEG_INFINITY`. | ||
/// | ||
/// ### Why is this bad? | ||
/// This should use the dedicated method instead, `is_infinite`. | ||
/// | ||
/// ### Example | ||
/// ```rust | ||
/// # let x = 1.0f32; | ||
/// if x == f32::INFINITY || x == f32::NEG_INFINITY {} | ||
/// ``` | ||
/// Use instead: | ||
/// ```rust | ||
/// # let x = 1.0f32; | ||
/// if x.is_infinite() {} | ||
/// ``` | ||
#[clippy::version = "1.72.0"] | ||
pub MANUAL_IS_INFINITE, | ||
style, | ||
"use dedicated method to check if a float is infinite" | ||
} | ||
declare_clippy_lint! { | ||
/// ### What it does | ||
/// Checks for `x != <float>::INFINITY && x != <float>::NEG_INFINITY`. | ||
/// | ||
/// ### Why is this bad? | ||
/// This should use the dedicated method instead, `is_finite`. | ||
/// | ||
/// ### Example | ||
/// ```rust | ||
/// # let x = 1.0f32; | ||
/// if x != f32::INFINITY && x != f32::NEG_INFINITY {} | ||
/// ``` | ||
/// Use instead: | ||
/// ```rust | ||
/// # let x = 1.0f32; | ||
/// if x.is_finite() {} | ||
/// ``` | ||
#[clippy::version = "1.72.0"] | ||
pub MANUAL_IS_FINITE, | ||
style, | ||
"use dedicated method to check if a float is finite" | ||
} | ||
declare_lint_pass!(ManualFloatMethods => [MANUAL_IS_INFINITE, MANUAL_IS_FINITE]); | ||
|
||
impl<'tcx> LateLintPass<'tcx> for ManualFloatMethods { | ||
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) { | ||
if !in_external_macro(cx.sess(), expr.span) | ||
&& let ExprKind::Binary(kind, lhs, rhs) = expr.kind | ||
&& let ExprKind::Binary(lhs_kind, lhs_lhs, lhs_rhs) = lhs.kind | ||
&& let ExprKind::Binary(rhs_kind, rhs_lhs, rhs_rhs) = rhs.kind | ||
&& let (operands, consts) = [lhs_lhs, lhs_rhs, rhs_lhs, rhs_rhs] | ||
.into_iter() | ||
.partition::<Vec<&Expr<'_>>, _>(|i| path_to_local(i).is_some()) | ||
&& let [first, second] = &*operands | ||
&& let Some([const_1, const_2]) = consts | ||
.into_iter() | ||
.map(|i| constant(cx, cx.typeck_results(), i).and_then(|c| c.to_bits())) | ||
.collect::<Option<Vec<_>>>() | ||
.as_deref() | ||
&& path_to_local(first).is_some_and(|f| path_to_local(second).is_some_and(|s| f == s)) | ||
&& (is_infinity(*const_1) && is_neg_infinity(*const_2) | ||
|| is_neg_infinity(*const_1) && is_infinity(*const_2)) | ||
&& let Some(local_snippet) = snippet_opt(cx, first.span) | ||
&& !is_from_proc_macro(cx, expr) | ||
{ | ||
let (msg, lint, sugg_fn) = match (kind.node, lhs_kind.node, rhs_kind.node) { | ||
(BinOpKind::Or, BinOpKind::Eq, BinOpKind::Eq) => { | ||
("manually checking if a float is infinite", MANUAL_IS_INFINITE, "is_infinite") | ||
}, | ||
(BinOpKind::And, BinOpKind::Ne, BinOpKind::Ne) => { | ||
("manually checking if a float is finite", MANUAL_IS_FINITE, "is_finite") | ||
}, | ||
_ => return, | ||
}; | ||
|
||
span_lint_and_sugg( | ||
cx, | ||
lint, | ||
expr.span, | ||
msg, | ||
"try", | ||
format!("{local_snippet}.{sugg_fn}()"), | ||
Applicability::MachineApplicable, | ||
); | ||
} | ||
} | ||
} | ||
|
||
fn is_infinity(bits: u128) -> bool { | ||
bits == 0x7f80_0000 || bits == 0x7ff0_0000_0000_0000 | ||
} | ||
|
||
fn is_neg_infinity(bits: u128) -> bool { | ||
bits == 0xff80_0000 || bits == 0xfff0_0000_0000_0000 | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,37 @@ | ||
//@run-rustfix | ||
//@aux-build:proc_macros.rs:proc-macro | ||
#![allow(clippy::needless_if, unused)] | ||
#![warn(clippy::manual_is_infinite, clippy::manual_is_finite)] | ||
|
||
#[macro_use] | ||
extern crate proc_macros; | ||
|
||
const INFINITE: f32 = f32::INFINITY; | ||
const NEG_INFINITE: f32 = f32::NEG_INFINITY; | ||
|
||
fn main() { | ||
let x = 1.0f32; | ||
if x.is_infinite() {} | ||
if x.is_finite() {} | ||
if x.is_infinite() {} | ||
if x.is_finite() {} | ||
let x = 1.0f64; | ||
if x.is_infinite() {} | ||
if x.is_finite() {} | ||
// Don't lint | ||
if x.is_infinite() {} | ||
if x.is_finite() {} | ||
// If they're doing it this way, they probably know what they're doing | ||
if x.abs() < f64::INFINITY {} | ||
external! { | ||
let x = 1.0; | ||
if x == f32::INFINITY || x == f32::NEG_INFINITY {} | ||
if x != f32::INFINITY && x != f32::NEG_INFINITY {} | ||
} | ||
with_span! { | ||
span | ||
let x = 1.0; | ||
if x == f32::INFINITY || x == f32::NEG_INFINITY {} | ||
if x != f32::INFINITY && x != f32::NEG_INFINITY {} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,37 @@ | ||
//@run-rustfix | ||
//@aux-build:proc_macros.rs:proc-macro | ||
#![allow(clippy::needless_if, unused)] | ||
#![warn(clippy::manual_is_infinite, clippy::manual_is_finite)] | ||
|
||
#[macro_use] | ||
extern crate proc_macros; | ||
|
||
const INFINITE: f32 = f32::INFINITY; | ||
const NEG_INFINITE: f32 = f32::NEG_INFINITY; | ||
|
||
fn main() { | ||
let x = 1.0f32; | ||
if x == f32::INFINITY || x == f32::NEG_INFINITY {} | ||
if x != f32::INFINITY && x != f32::NEG_INFINITY {} | ||
if x == INFINITE || x == NEG_INFINITE {} | ||
if x != INFINITE && x != NEG_INFINITE {} | ||
let x = 1.0f64; | ||
if x == f64::INFINITY || x == f64::NEG_INFINITY {} | ||
if x != f64::INFINITY && x != f64::NEG_INFINITY {} | ||
// Don't lint | ||
if x.is_infinite() {} | ||
if x.is_finite() {} | ||
// If they're doing it this way, they probably know what they're doing | ||
if x.abs() < f64::INFINITY {} | ||
external! { | ||
let x = 1.0; | ||
if x == f32::INFINITY || x == f32::NEG_INFINITY {} | ||
if x != f32::INFINITY && x != f32::NEG_INFINITY {} | ||
} | ||
with_span! { | ||
span | ||
let x = 1.0; | ||
if x == f32::INFINITY || x == f32::NEG_INFINITY {} | ||
if x != f32::INFINITY && x != f32::NEG_INFINITY {} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,42 @@ | ||
error: manually checking if a float is infinite | ||
--> $DIR/manual_float_methods.rs:14:8 | ||
| | ||
LL | if x == f32::INFINITY || x == f32::NEG_INFINITY {} | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `x.is_infinite()` | ||
| | ||
= note: `-D clippy::manual-is-infinite` implied by `-D warnings` | ||
|
||
error: manually checking if a float is finite | ||
--> $DIR/manual_float_methods.rs:15:8 | ||
| | ||
LL | if x != f32::INFINITY && x != f32::NEG_INFINITY {} | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `x.is_finite()` | ||
| | ||
= note: `-D clippy::manual-is-finite` implied by `-D warnings` | ||
|
||
error: manually checking if a float is infinite | ||
--> $DIR/manual_float_methods.rs:16:8 | ||
| | ||
LL | if x == INFINITE || x == NEG_INFINITE {} | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `x.is_infinite()` | ||
|
||
error: manually checking if a float is finite | ||
--> $DIR/manual_float_methods.rs:17:8 | ||
| | ||
LL | if x != INFINITE && x != NEG_INFINITE {} | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `x.is_finite()` | ||
|
||
error: manually checking if a float is infinite | ||
--> $DIR/manual_float_methods.rs:19:8 | ||
| | ||
LL | if x == f64::INFINITY || x == f64::NEG_INFINITY {} | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `x.is_infinite()` | ||
|
||
error: manually checking if a float is finite | ||
--> $DIR/manual_float_methods.rs:20:8 | ||
| | ||
LL | if x != f64::INFINITY && x != f64::NEG_INFINITY {} | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `x.is_finite()` | ||
|
||
error: aborting due to 6 previous errors | ||
|