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https://github.com/rust-lang/rust-clippy
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Auto merge of #9559 - c410-f3r:arith, r=Alexendoo
Fix #9544 Fix #9544 r? `@Alexendoo` changelog: [`arithmetic_side_effects`]: Fix false negative for `CustomType / usize`, `CustomType * float` and similar
This commit is contained in:
bors
commit
e8c1b5478c
3 changed files with 270 additions and 60 deletions
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@ -9,6 +9,7 @@ use rustc_ast as ast;
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use rustc_data_structures::fx::FxHashSet;
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use rustc_hir as hir;
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_middle::ty::Ty;
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use rustc_session::impl_lint_pass;
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use rustc_span::source_map::{Span, Spanned};
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@ -16,8 +17,9 @@ const HARD_CODED_ALLOWED: &[&str] = &[
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"f32",
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"f64",
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"std::num::Saturating",
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"std::string::String",
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"std::num::Wrapping",
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"std::string::String",
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"&str",
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];
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#[derive(Debug)]
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@ -60,15 +62,14 @@ impl ArithmeticSideEffects {
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}
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/// Checks if the given `expr` has any of the inner `allowed` elements.
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fn is_allowed_ty(&self, cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
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self.allowed.contains(
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cx.typeck_results()
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.expr_ty(expr)
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.to_string()
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.split('<')
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.next()
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.unwrap_or_default(),
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)
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fn is_allowed_ty(&self, ty: Ty<'_>) -> bool {
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self.allowed
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.contains(ty.to_string().split('<').next().unwrap_or_default())
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}
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// For example, 8i32 or &i64::MAX.
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fn is_integral(ty: Ty<'_>) -> bool {
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ty.peel_refs().is_integral()
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}
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// Common entry-point to avoid code duplication.
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@ -82,24 +83,13 @@ impl ArithmeticSideEffects {
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/// * Is `expr` is a literal integer reference like `&199`, returns the literal integer without
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/// references.
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/// * If `expr` is anything else, returns `None`.
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fn literal_integer<'expr, 'tcx>(
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cx: &LateContext<'tcx>,
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expr: &'expr hir::Expr<'tcx>,
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) -> Option<&'expr hir::Expr<'tcx>> {
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let expr_refs = cx.typeck_results().expr_ty(expr).peel_refs();
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if !expr_refs.is_integral() {
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return None;
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}
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fn literal_integer<'expr, 'tcx>(expr: &'expr hir::Expr<'tcx>) -> Option<&'expr hir::Expr<'tcx>> {
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if matches!(expr.kind, hir::ExprKind::Lit(_)) {
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return Some(expr);
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}
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if let hir::ExprKind::AddrOf(.., inn) = expr.kind && let hir::ExprKind::Lit(_) = inn.kind {
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return Some(inn)
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}
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None
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}
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@ -128,14 +118,21 @@ impl ArithmeticSideEffects {
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) {
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return;
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};
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if self.is_allowed_ty(cx, lhs) || self.is_allowed_ty(cx, rhs) {
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let lhs_ty = cx.typeck_results().expr_ty(lhs);
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let rhs_ty = cx.typeck_results().expr_ty(rhs);
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let lhs_and_rhs_have_the_same_ty = lhs_ty == rhs_ty;
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if lhs_and_rhs_have_the_same_ty && self.is_allowed_ty(lhs_ty) && self.is_allowed_ty(rhs_ty) {
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return;
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}
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let has_valid_op = match (Self::literal_integer(cx, lhs), Self::literal_integer(cx, rhs)) {
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(None, None) => false,
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(None, Some(local_expr)) => Self::has_valid_op(op, local_expr),
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(Some(local_expr), None) => Self::has_valid_op(op, local_expr),
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(Some(_), Some(_)) => true,
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let has_valid_op = if Self::is_integral(lhs_ty) && Self::is_integral(rhs_ty) {
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match (Self::literal_integer(lhs), Self::literal_integer(rhs)) {
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(None, None) => false,
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(None, Some(local_expr)) => Self::has_valid_op(op, local_expr),
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(Some(local_expr), None) => Self::has_valid_op(op, local_expr),
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(Some(_), Some(_)) => true,
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}
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} else {
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false
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};
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if !has_valid_op {
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self.issue_lint(cx, expr);
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@ -12,6 +12,31 @@
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use core::num::{Saturating, Wrapping};
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pub struct Custom;
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macro_rules! impl_arith {
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( $( $_trait:ident, $ty:ty, $method:ident; )* ) => {
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$(
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impl core::ops::$_trait<$ty> for Custom {
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type Output = Self;
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fn $method(self, _: $ty) -> Self::Output { Self }
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}
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)*
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}
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}
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impl_arith!(
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Add, i32, add;
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Div, i32, div;
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Mul, i32, mul;
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Sub, i32, sub;
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Add, f64, add;
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Div, f64, div;
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Mul, f64, mul;
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Sub, f64, sub;
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);
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pub fn association_with_structures_should_not_trigger_the_lint() {
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enum Foo {
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Bar = -2,
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@ -130,7 +155,7 @@ pub fn non_overflowing_ops_or_ops_already_handled_by_the_compiler_should_not_tri
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_n = -(-1);
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}
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pub fn overflowing_runtime_ops() {
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pub fn runtime_ops() {
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let mut _n = i32::MAX;
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// Assign
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@ -163,6 +188,32 @@ pub fn overflowing_runtime_ops() {
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_n = 2 * _n;
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_n = &2 * _n;
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// Custom
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let _ = Custom + 0;
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let _ = Custom + 1;
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let _ = Custom + 2;
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let _ = Custom + 0.0;
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let _ = Custom + 1.0;
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let _ = Custom + 2.0;
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let _ = Custom - 0;
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let _ = Custom - 1;
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let _ = Custom - 2;
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let _ = Custom - 0.0;
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let _ = Custom - 1.0;
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let _ = Custom - 2.0;
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let _ = Custom / 0;
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let _ = Custom / 1;
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let _ = Custom / 2;
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let _ = Custom / 0.0;
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let _ = Custom / 1.0;
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let _ = Custom / 2.0;
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let _ = Custom * 0;
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let _ = Custom * 1;
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let _ = Custom * 2;
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let _ = Custom * 0.0;
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let _ = Custom * 1.0;
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let _ = Custom * 2.0;
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// Unary
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_n = -_n;
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_n = -&_n;
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@ -1,172 +1,334 @@
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:137:5
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--> $DIR/arithmetic_side_effects.rs:78:13
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|
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LL | _n += 1;
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| ^^^^^^^
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LL | let _ = String::new() + "";
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| ^^^^^^^^^^^^^^^^^^
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|
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= note: `-D clippy::arithmetic-side-effects` implied by `-D warnings`
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:138:5
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--> $DIR/arithmetic_side_effects.rs:86:27
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|
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LL | let inferred_string = string + "";
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| ^^^^^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:90:13
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LL | let _ = inferred_string + "";
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| ^^^^^^^^^^^^^^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:162:5
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|
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LL | _n += 1;
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| ^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:163:5
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|
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LL | _n += &1;
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| ^^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:139:5
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--> $DIR/arithmetic_side_effects.rs:164:5
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|
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LL | _n -= 1;
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| ^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:140:5
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--> $DIR/arithmetic_side_effects.rs:165:5
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|
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LL | _n -= &1;
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| ^^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:141:5
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--> $DIR/arithmetic_side_effects.rs:166:5
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|
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LL | _n /= 0;
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| ^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:142:5
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--> $DIR/arithmetic_side_effects.rs:167:5
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|
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LL | _n /= &0;
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| ^^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:143:5
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--> $DIR/arithmetic_side_effects.rs:168:5
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|
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LL | _n %= 0;
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| ^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:144:5
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--> $DIR/arithmetic_side_effects.rs:169:5
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|
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LL | _n %= &0;
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| ^^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:145:5
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--> $DIR/arithmetic_side_effects.rs:170:5
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|
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LL | _n *= 2;
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| ^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:146:5
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--> $DIR/arithmetic_side_effects.rs:171:5
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|
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LL | _n *= &2;
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| ^^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:149:10
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--> $DIR/arithmetic_side_effects.rs:174:10
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|
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LL | _n = _n + 1;
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| ^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:150:10
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--> $DIR/arithmetic_side_effects.rs:175:10
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|
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LL | _n = _n + &1;
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| ^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:151:10
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--> $DIR/arithmetic_side_effects.rs:176:10
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|
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LL | _n = 1 + _n;
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| ^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:152:10
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--> $DIR/arithmetic_side_effects.rs:177:10
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|
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LL | _n = &1 + _n;
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| ^^^^^^^
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:153:10
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--> $DIR/arithmetic_side_effects.rs:178:10
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|
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LL | _n = _n - 1;
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| ^^^^^^
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|
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:154:10
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--> $DIR/arithmetic_side_effects.rs:179:10
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|
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LL | _n = _n - &1;
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| ^^^^^^^
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|
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:155:10
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--> $DIR/arithmetic_side_effects.rs:180:10
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|
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LL | _n = 1 - _n;
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| ^^^^^^
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|
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:156:10
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--> $DIR/arithmetic_side_effects.rs:181:10
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|
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LL | _n = &1 - _n;
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| ^^^^^^^
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|
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error: arithmetic operation that can potentially result in unexpected side-effects
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--> $DIR/arithmetic_side_effects.rs:157:10
|
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--> $DIR/arithmetic_side_effects.rs:182:10
|
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|
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LL | _n = _n / 0;
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| ^^^^^^
|
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|
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error: arithmetic operation that can potentially result in unexpected side-effects
|
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--> $DIR/arithmetic_side_effects.rs:158:10
|
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--> $DIR/arithmetic_side_effects.rs:183:10
|
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|
|
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LL | _n = _n / &0;
|
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| ^^^^^^^
|
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|
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error: arithmetic operation that can potentially result in unexpected side-effects
|
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--> $DIR/arithmetic_side_effects.rs:159:10
|
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--> $DIR/arithmetic_side_effects.rs:184:10
|
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|
|
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LL | _n = _n % 0;
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| ^^^^^^
|
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|
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error: arithmetic operation that can potentially result in unexpected side-effects
|
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--> $DIR/arithmetic_side_effects.rs:160:10
|
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--> $DIR/arithmetic_side_effects.rs:185:10
|
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|
|
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LL | _n = _n % &0;
|
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| ^^^^^^^
|
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|
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error: arithmetic operation that can potentially result in unexpected side-effects
|
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--> $DIR/arithmetic_side_effects.rs:161:10
|
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--> $DIR/arithmetic_side_effects.rs:186:10
|
||||
|
|
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LL | _n = _n * 2;
|
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| ^^^^^^
|
||||
|
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error: arithmetic operation that can potentially result in unexpected side-effects
|
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--> $DIR/arithmetic_side_effects.rs:162:10
|
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--> $DIR/arithmetic_side_effects.rs:187:10
|
||||
|
|
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LL | _n = _n * &2;
|
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| ^^^^^^^
|
||||
|
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error: arithmetic operation that can potentially result in unexpected side-effects
|
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--> $DIR/arithmetic_side_effects.rs:163:10
|
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--> $DIR/arithmetic_side_effects.rs:188:10
|
||||
|
|
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LL | _n = 2 * _n;
|
||||
| ^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
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--> $DIR/arithmetic_side_effects.rs:164:10
|
||||
--> $DIR/arithmetic_side_effects.rs:189:10
|
||||
|
|
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LL | _n = &2 * _n;
|
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| ^^^^^^^
|
||||
|
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error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:167:10
|
||||
--> $DIR/arithmetic_side_effects.rs:192:13
|
||||
|
|
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LL | let _ = Custom + 0;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:193:13
|
||||
|
|
||||
LL | let _ = Custom + 1;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:194:13
|
||||
|
|
||||
LL | let _ = Custom + 2;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:195:13
|
||||
|
|
||||
LL | let _ = Custom + 0.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:196:13
|
||||
|
|
||||
LL | let _ = Custom + 1.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:197:13
|
||||
|
|
||||
LL | let _ = Custom + 2.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:198:13
|
||||
|
|
||||
LL | let _ = Custom - 0;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:199:13
|
||||
|
|
||||
LL | let _ = Custom - 1;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:200:13
|
||||
|
|
||||
LL | let _ = Custom - 2;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:201:13
|
||||
|
|
||||
LL | let _ = Custom - 0.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:202:13
|
||||
|
|
||||
LL | let _ = Custom - 1.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:203:13
|
||||
|
|
||||
LL | let _ = Custom - 2.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:204:13
|
||||
|
|
||||
LL | let _ = Custom / 0;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:205:13
|
||||
|
|
||||
LL | let _ = Custom / 1;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:206:13
|
||||
|
|
||||
LL | let _ = Custom / 2;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:207:13
|
||||
|
|
||||
LL | let _ = Custom / 0.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:208:13
|
||||
|
|
||||
LL | let _ = Custom / 1.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:209:13
|
||||
|
|
||||
LL | let _ = Custom / 2.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:210:13
|
||||
|
|
||||
LL | let _ = Custom * 0;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:211:13
|
||||
|
|
||||
LL | let _ = Custom * 1;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:212:13
|
||||
|
|
||||
LL | let _ = Custom * 2;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:213:13
|
||||
|
|
||||
LL | let _ = Custom * 0.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:214:13
|
||||
|
|
||||
LL | let _ = Custom * 1.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:215:13
|
||||
|
|
||||
LL | let _ = Custom * 2.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:218:10
|
||||
|
|
||||
LL | _n = -_n;
|
||||
| ^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:168:10
|
||||
--> $DIR/arithmetic_side_effects.rs:219:10
|
||||
|
|
||||
LL | _n = -&_n;
|
||||
| ^^^^
|
||||
|
||||
error: aborting due to 28 previous errors
|
||||
error: aborting due to 55 previous errors
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue