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|
use super::TRANSMUTE_INT_TO_NON_ZERO;
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::sugg;
use rustc_errors::Applicability;
use rustc_hir::Expr;
use rustc_lint::LateContext;
use rustc_middle::{
query::Key,
ty::{self, Ty},
};
use rustc_span::symbol::sym;
/// Checks for `transmute_int_to_non_zero` lint.
/// Returns `true` if it's triggered, otherwise returns `false`.
pub(super) fn check<'tcx>(
cx: &LateContext<'tcx>,
e: &'tcx Expr<'_>,
from_ty: Ty<'tcx>,
to_ty: Ty<'tcx>,
arg: &'tcx Expr<'_>,
) -> bool {
let (ty::Int(_) | ty::Uint(_), Some(to_ty_id)) = (&from_ty.kind(), to_ty.ty_adt_id()) else {
return false;
};
let Some(to_type_sym) = cx.tcx.get_diagnostic_name(to_ty_id) else {
return false;
};
if !matches!(
to_type_sym,
sym::NonZeroU8
| sym::NonZeroU16
| sym::NonZeroU32
| sym::NonZeroU64
| sym::NonZeroU128
| sym::NonZeroI8
| sym::NonZeroI16
| sym::NonZeroI32
| sym::NonZeroI64
| sym::NonZeroI128
) {
return false;
}
span_lint_and_then(
cx,
TRANSMUTE_INT_TO_NON_ZERO,
e.span,
&format!("transmute from a `{from_ty}` to a `{to_type_sym}`"),
|diag| {
let arg = sugg::Sugg::hir(cx, arg, "..");
diag.span_suggestion(
e.span,
"consider using",
format!("{to_type_sym}::{}({arg})", sym::new_unchecked),
Applicability::Unspecified,
);
},
);
true
}
|
