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use super::CROSSPOINTER_TRANSMUTE;
use clippy_utils::diagnostics::span_lint;
use rustc_hir::Expr;
use rustc_lint::LateContext;
use rustc_middle::ty::{self, Ty};
/// Checks for `crosspointer_transmute` 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>) -> bool {
match (&from_ty.kind(), &to_ty.kind()) {
(ty::RawPtr(from_ptr), _) if from_ptr.ty == to_ty => {
span_lint(
cx,
CROSSPOINTER_TRANSMUTE,
e.span,
&format!("transmute from a type (`{from_ty}`) to the type that it points to (`{to_ty}`)"),
);
true
},
(_, ty::RawPtr(to_ptr)) if to_ptr.ty == from_ty => {
span_lint(
cx,
CROSSPOINTER_TRANSMUTE,
e.span,
&format!("transmute from a type (`{from_ty}`) to a pointer to that type (`{to_ty}`)"),
);
true
},
_ => false,
}
}
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