1 files changed, 36 insertions, 0 deletions
diff --git a/src/tools/clippy/clippy_lints/src/transmute/transmute_ptr_to_ptr.rs b/src/tools/clippy/clippy_lints/src/transmute/transmute_ptr_to_ptr.rs
new file mode 100644
index 000000000..31a9b69ca
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/transmute/transmute_ptr_to_ptr.rs
@@ -0,0 +1,36 @@
+use super::TRANSMUTE_PTR_TO_PTR;
+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_ptr_to_ptr` 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 {
+    match (&from_ty.kind(), &to_ty.kind()) {
+        (ty::RawPtr(_), ty::RawPtr(to_ty)) => {
+            span_lint_and_then(
+                cx,
+                TRANSMUTE_PTR_TO_PTR,
+                e.span,
+                "transmute from a pointer to a pointer",
+                |diag| {
+                    if let Some(arg) = sugg::Sugg::hir_opt(cx, arg) {
+                        let sugg = arg.as_ty(cx.tcx.mk_ptr(*to_ty));
+                        diag.span_suggestion(e.span, "try", sugg, Applicability::Unspecified);
+                    }
+                },
+            );
+            true
+        },
+        _ => false,
+    }
+}