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use super::utils::can_be_expressed_as_pointer_cast;
use super::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS;
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::ty::Ty;
/// Checks for `transmutes_expressible_as_ptr_casts` 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 {
if can_be_expressed_as_pointer_cast(cx, e, from_ty, to_ty) {
span_lint_and_then(
cx,
TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS,
e.span,
&format!("transmute from `{from_ty}` to `{to_ty}` which could be expressed as a pointer cast instead"),
|diag| {
if let Some(arg) = sugg::Sugg::hir_opt(cx, arg) {
let sugg = arg.as_ty(to_ty.to_string()).to_string();
diag.span_suggestion(e.span, "try", sugg, Applicability::MachineApplicable);
}
},
);
true
} else {
false
}
}
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