[arithmetic-side-effects] Detect overflowing associated constants of integers
This commit is contained in:
Caio
parent
d15e5e6ad6
commit
98b343c5e6
@ -1,12 +1,19 @@
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use super::ARITHMETIC_SIDE_EFFECTS;
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use clippy_utils::{consts::constant_simple, diagnostics::span_lint};
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use clippy_utils::{
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consts::{constant, constant_simple},
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diagnostics::span_lint,
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peel_hir_expr_refs,
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};
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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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use rustc_span::{
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source_map::{Span, Spanned},
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sym,
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};
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const HARD_CODED_ALLOWED: &[&str] = &[
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"&str",
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@ -38,24 +45,6 @@ pub fn new(mut allowed: FxHashSet<String>) -> Self {
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}
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}
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/// Assuming that `expr` is a literal integer, checks operators (+=, -=, *, /) in a
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/// non-constant environment that won't overflow.
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fn has_valid_op(op: &Spanned<hir::BinOpKind>, expr: &hir::Expr<'_>) -> bool {
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if let hir::ExprKind::Lit(ref lit) = expr.kind &&
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let ast::LitKind::Int(value, _) = lit.node
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{
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match (&op.node, value) {
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(hir::BinOpKind::Div | hir::BinOpKind::Rem, 0) => false,
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(hir::BinOpKind::Add | hir::BinOpKind::Sub, 0)
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| (hir::BinOpKind::Div | hir::BinOpKind::Rem, _)
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| (hir::BinOpKind::Mul, 0 | 1) => true,
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_ => false,
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}
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} else {
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false
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}
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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, ty: Ty<'_>) -> bool {
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self.allowed
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@ -74,15 +63,14 @@ fn issue_lint(&mut self, cx: &LateContext<'_>, expr: &hir::Expr<'_>) {
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self.expr_span = Some(expr.span);
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}
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/// If `expr` does not match any variant of `LiteralIntegerTy`, returns `None`.
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fn literal_integer<'expr, 'tcx>(expr: &'expr hir::Expr<'tcx>) -> Option<LiteralIntegerTy<'expr, 'tcx>> {
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if matches!(expr.kind, hir::ExprKind::Lit(_)) {
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return Some(LiteralIntegerTy::Value(expr));
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/// If `expr` is not a literal integer like `1`, returns `None`.
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fn literal_integer(expr: &hir::Expr<'_>) -> Option<u128> {
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if let hir::ExprKind::Lit(ref lit) = expr.kind && let ast::LitKind::Int(n, _) = lit.node {
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Some(n)
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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(LiteralIntegerTy::Ref(inn));
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else {
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None
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}
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None
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}
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/// Manages when the lint should be triggered. Operations in constant environments, hard coded
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@ -117,10 +105,20 @@ fn manage_bin_ops<'tcx>(
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return;
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}
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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, Some(lit_int_ty)) | (Some(lit_int_ty), None) => Self::has_valid_op(op, lit_int_ty.into()),
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(Some(LiteralIntegerTy::Value(_)), Some(LiteralIntegerTy::Value(_))) => true,
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(None, None) | (Some(_), Some(_)) => false,
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let (actual_lhs, lhs_ref_counter) = peel_hir_expr_refs(lhs);
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let (actual_rhs, rhs_ref_counter) = peel_hir_expr_refs(rhs);
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match (Self::literal_integer(actual_lhs), Self::literal_integer(actual_rhs)) {
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(None, None) => false,
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(None, Some(n)) | (Some(n), None) => match (&op.node, n) {
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(hir::BinOpKind::Div | hir::BinOpKind::Rem, 0) => false,
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(hir::BinOpKind::Add | hir::BinOpKind::Sub, 0)
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| (hir::BinOpKind::Div | hir::BinOpKind::Rem, _)
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| (hir::BinOpKind::Mul, 0 | 1) => true,
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_ => false,
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},
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(Some(_), Some(_)) => {
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matches!((lhs_ref_counter, rhs_ref_counter), (0, 0))
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},
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}
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} else {
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false
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@ -129,21 +127,45 @@ fn manage_bin_ops<'tcx>(
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self.issue_lint(cx, expr);
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}
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}
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fn manage_unary_ops<'tcx>(
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&mut self,
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cx: &LateContext<'tcx>,
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expr: &hir::Expr<'tcx>,
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un_expr: &hir::Expr<'tcx>,
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un_op: hir::UnOp,
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) {
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let hir::UnOp::Neg = un_op else { return; };
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if constant(cx, cx.typeck_results(), un_expr).is_some() {
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return;
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}
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let ty = cx.typeck_results().expr_ty(expr).peel_refs();
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if self.is_allowed_ty(ty) {
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return;
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}
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let actual_un_expr = peel_hir_expr_refs(un_expr).0;
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if Self::literal_integer(actual_un_expr).is_some() {
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return;
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}
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self.issue_lint(cx, expr);
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}
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fn should_skip_expr(&mut self, expr: &hir::Expr<'_>) -> bool {
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self.expr_span.is_some() || self.const_span.map_or(false, |sp| sp.contains(expr.span))
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}
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}
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impl<'tcx> LateLintPass<'tcx> for ArithmeticSideEffects {
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fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &hir::Expr<'tcx>) {
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if self.expr_span.is_some() || self.const_span.map_or(false, |sp| sp.contains(expr.span)) {
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if self.should_skip_expr(expr) {
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return;
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}
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match &expr.kind {
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hir::ExprKind::Binary(op, lhs, rhs) | hir::ExprKind::AssignOp(op, lhs, rhs) => {
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hir::ExprKind::AssignOp(op, lhs, rhs) | hir::ExprKind::Binary(op, lhs, rhs) => {
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self.manage_bin_ops(cx, expr, op, lhs, rhs);
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},
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hir::ExprKind::Unary(hir::UnOp::Neg, _) => {
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if constant_simple(cx, cx.typeck_results(), expr).is_none() {
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self.issue_lint(cx, expr);
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}
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hir::ExprKind::Unary(un_op, un_expr) => {
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self.manage_unary_ops(cx, expr, un_expr, *un_op);
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},
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_ => {},
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}
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@ -177,22 +199,3 @@ fn check_expr_post(&mut self, _: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>)
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}
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}
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}
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/// Tells if an expression is a integer declared by value or by reference.
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///
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/// If `LiteralIntegerTy::Ref`, then the contained value will be `hir::ExprKind::Lit` rather
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/// than `hirExprKind::Addr`.
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enum LiteralIntegerTy<'expr, 'tcx> {
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/// For example, `&199`
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Ref(&'expr hir::Expr<'tcx>),
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/// For example, `1` or `i32::MAX`
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Value(&'expr hir::Expr<'tcx>),
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}
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impl<'expr, 'tcx> From<LiteralIntegerTy<'expr, 'tcx>> for &'expr hir::Expr<'tcx> {
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fn from(from: LiteralIntegerTy<'expr, 'tcx>) -> Self {
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match from {
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LiteralIntegerTy::Ref(elem) | LiteralIntegerTy::Value(elem) => elem,
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}
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}
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}
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@ -1,6 +1,6 @@
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#![warn(clippy::arithmetic_side_effects)]
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use core::ops::Add;
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use core::ops::{Add, Neg};
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#[derive(Clone, Copy)]
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struct Point {
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@ -16,9 +16,18 @@ fn add(self, other: Self) -> Self {
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}
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}
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impl Neg for Point {
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type Output = Self;
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fn neg(self) -> Self::Output {
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todo!()
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}
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}
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fn main() {
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let _ = Point { x: 1, y: 0 } + Point { x: 2, y: 3 };
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let point: Point = Point { x: 1, y: 0 };
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let _ = point + point;
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let _ = -point;
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}
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@ -150,8 +150,12 @@ pub fn non_overflowing_ops_or_ops_already_handled_by_the_compiler_should_not_tri
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_n = 23 + 85;
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// Unary
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_n = -1;
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_n = -(-1);
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_n = -2147483647;
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_n = -i32::MAX;
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_n = -i32::MIN;
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_n = -&2147483647;
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_n = -&i32::MAX;
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_n = -&i32::MIN;
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}
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pub fn runtime_ops() {
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@ -19,331 +19,331 @@ 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:161:5
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--> $DIR/arithmetic_side_effects.rs:165:5
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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:162:5
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--> $DIR/arithmetic_side_effects.rs:166:5
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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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--> $DIR/arithmetic_side_effects.rs:167:5
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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:164:5
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--> $DIR/arithmetic_side_effects.rs:168:5
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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:165:5
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--> $DIR/arithmetic_side_effects.rs:169:5
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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:166:5
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--> $DIR/arithmetic_side_effects.rs:170:5
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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:167:5
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--> $DIR/arithmetic_side_effects.rs:171:5
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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:168:5
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--> $DIR/arithmetic_side_effects.rs:172:5
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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:169:5
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--> $DIR/arithmetic_side_effects.rs:173:5
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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:170:5
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--> $DIR/arithmetic_side_effects.rs:174:5
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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:173:10
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--> $DIR/arithmetic_side_effects.rs:177:10
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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:174:10
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--> $DIR/arithmetic_side_effects.rs:178:10
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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:175:10
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--> $DIR/arithmetic_side_effects.rs:179:10
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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:176:10
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--> $DIR/arithmetic_side_effects.rs:180:10
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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:177:10
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--> $DIR/arithmetic_side_effects.rs:181:10
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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:178:10
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--> $DIR/arithmetic_side_effects.rs:182:10
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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:179:10
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--> $DIR/arithmetic_side_effects.rs:183:10
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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:180:10
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--> $DIR/arithmetic_side_effects.rs:184:10
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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:181:10
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--> $DIR/arithmetic_side_effects.rs:185:10
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LL | _n = _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:182:10
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--> $DIR/arithmetic_side_effects.rs:186:10
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|
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LL | _n = _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:183:10
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--> $DIR/arithmetic_side_effects.rs:187:10
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|
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LL | _n = _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:184:10
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--> $DIR/arithmetic_side_effects.rs:188:10
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|
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LL | _n = _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:185:10
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--> $DIR/arithmetic_side_effects.rs:189:10
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|
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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:186:10
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--> $DIR/arithmetic_side_effects.rs:190:10
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|
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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:187:10
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--> $DIR/arithmetic_side_effects.rs:191:10
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|
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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
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--> $DIR/arithmetic_side_effects.rs:188:10
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--> $DIR/arithmetic_side_effects.rs:192:10
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|
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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
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--> $DIR/arithmetic_side_effects.rs:189:10
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--> $DIR/arithmetic_side_effects.rs:193:10
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|
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LL | _n = 23 + &85;
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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:190:10
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--> $DIR/arithmetic_side_effects.rs:194:10
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|
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LL | _n = &23 + 85;
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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:191:10
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--> $DIR/arithmetic_side_effects.rs:195:10
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|
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LL | _n = &23 + &85;
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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:194:13
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--> $DIR/arithmetic_side_effects.rs:198:13
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|
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LL | let _ = Custom + 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:195:13
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--> $DIR/arithmetic_side_effects.rs:199:13
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|
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LL | let _ = Custom + 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:196:13
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--> $DIR/arithmetic_side_effects.rs:200:13
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|
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LL | let _ = Custom + 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:197:13
|
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--> $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:198:13
|
||||
--> $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:199:13
|
||||
--> $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:200:13
|
||||
--> $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:201:13
|
||||
--> $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:202:13
|
||||
--> $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:203:13
|
||||
--> $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:204:13
|
||||
--> $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:205:13
|
||||
--> $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:206:13
|
||||
--> $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:207:13
|
||||
--> $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:208:13
|
||||
--> $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:209:13
|
||||
--> $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:210:13
|
||||
--> $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:211:13
|
||||
--> $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:212:13
|
||||
--> $DIR/arithmetic_side_effects.rs:216:13
|
||||
|
|
||||
LL | let _ = Custom * 0;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:213:13
|
||||
--> $DIR/arithmetic_side_effects.rs:217:13
|
||||
|
|
||||
LL | let _ = Custom * 1;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:214:13
|
||||
--> $DIR/arithmetic_side_effects.rs:218:13
|
||||
|
|
||||
LL | let _ = Custom * 2;
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:215:13
|
||||
--> $DIR/arithmetic_side_effects.rs:219:13
|
||||
|
|
||||
LL | let _ = Custom * 0.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:216:13
|
||||
--> $DIR/arithmetic_side_effects.rs:220:13
|
||||
|
|
||||
LL | let _ = Custom * 1.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:217:13
|
||||
--> $DIR/arithmetic_side_effects.rs:221:13
|
||||
|
|
||||
LL | let _ = Custom * 2.0;
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:220:10
|
||||
--> $DIR/arithmetic_side_effects.rs:224:10
|
||||
|
|
||||
LL | _n = -_n;
|
||||
| ^^^
|
||||
|
||||
error: arithmetic operation that can potentially result in unexpected side-effects
|
||||
--> $DIR/arithmetic_side_effects.rs:221:10
|
||||
--> $DIR/arithmetic_side_effects.rs:225:10
|
||||
|
|
||||
LL | _n = -&_n;
|
||||
| ^^^^
|
||||
|
||||
Loading…
Reference in New Issue
Block a user