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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| use clippy_utils::{ | ||
| diagnostics::span_lint_and_sugg, | ||
| get_parent_expr, is_from_proc_macro, last_path_segment, | ||
| msrvs::{self, Msrv}, | ||
| }; | ||
| use rustc_errors::Applicability; | ||
| use rustc_hir::{def::Res, def_id::DefId}; | ||
| use rustc_hir::{Expr, ExprKind, PrimTy, QPath, TyKind}; | ||
| use rustc_lint::{LateContext, LateLintPass, LintContext}; | ||
| use rustc_middle::lint::in_external_macro; | ||
| use rustc_session::{declare_tool_lint, impl_lint_pass}; | ||
| use rustc_span::{sym, Symbol}; | ||
|
|
||
| declare_clippy_lint! { | ||
| /// ### What it does | ||
| /// Checks for usage of `<integer>::max_value()`, `std::<integer>::MAX`, | ||
| /// `std::<float>::EPSILON`, etc. | ||
| /// | ||
| /// ### Why is this bad? | ||
| /// All of these have been superceded by the associated constants on their respective types, | ||
| /// such as `i128::MAX`. These legacy constants may be deprecated in a future version of rust. | ||
| /// | ||
| /// ### Example | ||
| /// ```rust | ||
| /// let eps = std::f32::EPSILON; | ||
| /// ``` | ||
| /// Use instead: | ||
| /// ```rust | ||
| /// let eps = f32::EPSILON; | ||
| /// ``` | ||
| #[clippy::version = "1.72.0"] | ||
| pub LEGACY_INTEGRAL_CONSTANTS, | ||
| style, | ||
| "checks for usage of legacy std integral constants" | ||
| } | ||
| pub struct LegacyIntegralConstants { | ||
| msrv: Msrv, | ||
| } | ||
|
|
||
| impl LegacyIntegralConstants { | ||
| #[must_use] | ||
| pub fn new(msrv: Msrv) -> Self { | ||
| Self { msrv } | ||
| } | ||
| } | ||
|
|
||
| impl_lint_pass!(LegacyIntegralConstants => [LEGACY_INTEGRAL_CONSTANTS]); | ||
|
|
||
| impl<'tcx> LateLintPass<'tcx> for LegacyIntegralConstants { | ||
| fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'tcx>) { | ||
| if !self.msrv.meets(msrvs::STD_INTEGRAL_CONSTANTS) || in_external_macro(cx.sess(), expr.span) { | ||
| return; | ||
| } | ||
| let ExprKind::Path(qpath) = expr.kind else { | ||
| return; | ||
| }; | ||
|
|
||
| // `std::<integer>::<CONST>` check | ||
| let (span, sugg, is_method) = if let QPath::Resolved(_, path) = qpath | ||
| && let Some(def_id) = path.res.opt_def_id() | ||
| && let Some(name) = path.segments.iter().last().map(|segment| segment.ident.name) | ||
| && let Some(module_name) = is_path_in_integral_module(cx, def_id) | ||
| { | ||
| ( | ||
| expr.span, | ||
| format!("{module_name}::{name}"), | ||
| false, | ||
| ) | ||
| // `<integer>::xxx_value` check | ||
| } else if let QPath::TypeRelative(ty, _) = qpath | ||
| && let TyKind::Path(ty_qpath) = ty.kind | ||
| && let Res::PrimTy(PrimTy::Int(_) | PrimTy::Uint(_)) = cx.qpath_res(&ty_qpath, ty.hir_id) | ||
| && let last_segment = last_path_segment(&qpath) | ||
| && let name = last_segment.ident.name.as_str() | ||
| && (name == "max_value" || name == "min_value") | ||
| // Also remove the `()` | ||
| && let Some(par_expr) = get_parent_expr(cx, expr) | ||
| && let ExprKind::Call(_, _) = par_expr.kind | ||
| { | ||
| ( | ||
| qpath.last_segment_span().with_hi(par_expr.span.hi()), | ||
| name[..=2].to_ascii_uppercase(), | ||
| true, | ||
| ) | ||
| } else { | ||
| return; | ||
| }; | ||
|
|
||
| if !is_from_proc_macro(cx, expr) { | ||
| let msg = if is_method { | ||
| "usage of a legacy integral constant method" | ||
| } else { | ||
| "usage of a legacy integral constant" | ||
| }; | ||
|
|
||
| span_lint_and_sugg( | ||
| cx, | ||
| LEGACY_INTEGRAL_CONSTANTS, | ||
| span, | ||
| msg, | ||
| "try using the associated constant instead", | ||
| sugg, | ||
| Applicability::MachineApplicable, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| extract_msrv_attr!(LateContext); | ||
| } | ||
|
|
||
| fn is_path_in_integral_module(cx: &LateContext<'_>, def_id: DefId) -> Option<Symbol> { | ||
| if let [ | ||
| sym::core, | ||
| module @ (sym::u8 | ||
| | sym::i8 | ||
| | sym::u16 | ||
| | sym::i16 | ||
| | sym::u32 | ||
| | sym::i32 | ||
| | sym::u64 | ||
| | sym::i64 | ||
| | sym::u128 | ||
| | sym::i128 | ||
| | sym::usize | ||
| | sym::isize | ||
| | sym::f32 | ||
| | sym::f64), | ||
| _, | ||
| ] = &*cx.get_def_path(def_id) | ||
| { | ||
| return Some(*module); | ||
| } | ||
|
|
||
| None | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| //@run-rustfix | ||
| //@aux-build:proc_macros.rs | ||
| #![allow(clippy::no_effect, deprecated, unused)] | ||
| #![warn(clippy::legacy_integral_constants)] | ||
|
|
||
| #[macro_use] | ||
| extern crate proc_macros; | ||
|
|
||
| fn main() { | ||
| f32::EPSILON; | ||
| u8::MIN; | ||
| usize::MIN; | ||
| u32::MAX; | ||
| use std::u32::MAX; | ||
| u32::MAX; | ||
| u32::MAX; | ||
| u8::MAX; | ||
| u8::MIN; | ||
| ::std::primitive::u8::MIN; | ||
| ::std::u8::MIN; | ||
| ::std::primitive::u8::MIN; | ||
| std::primitive::u32::MAX; | ||
| // Don't lint | ||
| f32::EPSILON; | ||
| u8::MIN; | ||
| external! { | ||
| ::std::primitive::u8::MIN; | ||
| ::std::u8::MIN; | ||
| ::std::primitive::u8::min_value(); | ||
| } | ||
| } |
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