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manual_rem_euclid: Check HIR tree first.

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This commit is contained in:
Jason Newcomb 2024-06-13 02:45:37 -04:00
parent 44f87e8cc1
commit 0f4cd13f66
1 changed files with 22 additions and 27 deletions
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49
clippy_lints/src/manual_rem_euclid.rs
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@ -48,35 +48,30 @@ pub fn new(msrv: Msrv) -> Self {
impl<'tcx> LateLintPass<'tcx> for ManualRemEuclid {
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
if !self.msrv.meets(msrvs::REM_EUCLID) {
return;
}
if in_constant(cx, expr.hir_id) && !self.msrv.meets(msrvs::REM_EUCLID_CONST) {
return;
}
if in_external_macro(cx.sess(), expr.span) {
return;
}
// (x % c + c) % c
if let ExprKind::Binary(op1, expr1, right) = expr.kind
&& op1.node == BinOpKind::Rem
if let ExprKind::Binary(rem_op, rem_lhs, rem_rhs) = expr.kind
&& rem_op.node == BinOpKind::Rem
&& let ExprKind::Binary(add_op, add_lhs, add_rhs) = rem_lhs.kind
&& add_op.node == BinOpKind::Add
&& let ctxt = expr.span.ctxt()
&& expr1.span.ctxt() == ctxt
&& let Some(const1) = check_for_unsigned_int_constant(cx, right)
&& let ExprKind::Binary(op2, left, right) = expr1.kind
&& op2.node == BinOpKind::Add
&& let Some((const2, expr2)) = check_for_either_unsigned_int_constant(cx, left, right)
&& expr2.span.ctxt() == ctxt
&& let ExprKind::Binary(op3, expr3, right) = expr2.kind
&& op3.node == BinOpKind::Rem
&& let Some(const3) = check_for_unsigned_int_constant(cx, right)
&& rem_lhs.span.ctxt() == ctxt
&& rem_rhs.span.ctxt() == ctxt
&& add_lhs.span.ctxt() == ctxt
&& add_rhs.span.ctxt() == ctxt
&& !in_external_macro(cx.sess(), expr.span)
&& self.msrv.meets(msrvs::REM_EUCLID)
&& (self.msrv.meets(msrvs::REM_EUCLID_CONST) || !in_constant(cx, expr.hir_id))
&& let Some(const1) = check_for_unsigned_int_constant(cx, rem_rhs)
&& let Some((const2, add_other)) = check_for_either_unsigned_int_constant(cx, add_lhs, add_rhs)
&& let ExprKind::Binary(rem2_op, rem2_lhs, rem2_rhs) = add_other.kind
&& rem2_op.node == BinOpKind::Rem
&& const1 == const2
&& let Some(hir_id) = path_to_local(rem2_lhs)
&& let Some(const3) = check_for_unsigned_int_constant(cx, rem2_rhs)
// Also ensures the const is nonzero since zero can't be a divisor
&& const1 == const2 && const2 == const3
&& let Some(hir_id) = path_to_local(expr3)
&& let Node::Pat(_) = cx.tcx.hir_node(hir_id)
&& const2 == const3
&& rem2_lhs.span.ctxt() == ctxt
&& rem2_rhs.span.ctxt() == ctxt
{
// Apply only to params or locals with annotated types
match cx.tcx.parent_hir_node(hir_id) {
@ -91,7 +86,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
};
let mut app = Applicability::MachineApplicable;
let rem_of = snippet_with_context(cx, expr3.span, ctxt, "_", &mut app).0;
let rem_of = snippet_with_context(cx, rem2_lhs.span, ctxt, "_", &mut app).0;
span_lint_and_sugg(
cx,
MANUAL_REM_EUCLID,