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use super::utils::is_layout_incompatible;
use super::UNSOUND_COLLECTION_TRANSMUTE;
use clippy_utils::diagnostics::span_lint;
use rustc_hir::Expr;
use rustc_lint::LateContext;
use rustc_middle::ty::{self, Ty};
use rustc_span::symbol::sym;
/// Checks for `unsound_collection_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::Adt(from_adt, from_substs), ty::Adt(to_adt, to_substs)) => {
if from_adt.did() != to_adt.did() {
return false;
}
if !matches!(
cx.tcx.get_diagnostic_name(to_adt.did()),
Some(
sym::BTreeMap
| sym::BTreeSet
| sym::BinaryHeap
| sym::HashMap
| sym::HashSet
| sym::Vec
| sym::VecDeque
)
) {
return false;
}
if from_substs
.types()
.zip(to_substs.types())
.any(|(from_ty, to_ty)| is_layout_incompatible(cx, from_ty, to_ty))
{
span_lint(
cx,
UNSOUND_COLLECTION_TRANSMUTE,
e.span,
&format!(
"transmute from `{}` to `{}` with mismatched layout is unsound",
from_ty, to_ty
),
);
true
} else {
false
}
},
_ => false,
}
}
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