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use super::TRANSMUTE_INT_TO_FLOAT;
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::{self, Ty};
/// Checks for `transmute_int_to_float` 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<'_>,
const_context: bool,
) -> bool {
match (&from_ty.kind(), &to_ty.kind()) {
(ty::Int(_) | ty::Uint(_), ty::Float(_)) if !const_context => {
span_lint_and_then(
cx,
TRANSMUTE_INT_TO_FLOAT,
e.span,
&format!("transmute from a `{}` to a `{}`", from_ty, to_ty),
|diag| {
let arg = sugg::Sugg::hir(cx, arg, "..");
let arg = if let ty::Int(int_ty) = from_ty.kind() {
arg.as_ty(format!(
"u{}",
int_ty.bit_width().map_or_else(|| "size".to_string(), |v| v.to_string())
))
} else {
arg
};
diag.span_suggestion(
e.span,
"consider using",
format!("{}::from_bits({})", to_ty, arg),
Applicability::Unspecified,
);
},
);
true
},
_ => false,
}
}
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