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use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::is_no_std_crate;
use clippy_utils::source::snippet_with_context;
use rustc_errors::Applicability;
use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability, Ty, TyKind};
use rustc_lint::LateContext;
use super::BORROW_AS_PTR;
pub(super) fn check<'tcx>(
cx: &LateContext<'tcx>,
expr: &'tcx Expr<'_>,
cast_expr: &'tcx Expr<'_>,
cast_to: &'tcx Ty<'_>,
) {
if matches!(cast_to.kind, TyKind::Ptr(_))
&& let ExprKind::AddrOf(BorrowKind::Ref, mutability, e) = cast_expr.kind
{
let core_or_std = if is_no_std_crate(cx) { "core" } else { "std" };
let macro_name = match mutability {
Mutability::Not => "addr_of",
Mutability::Mut => "addr_of_mut",
};
let mut app = Applicability::MachineApplicable;
let snip = snippet_with_context(cx, e.span, cast_expr.span.ctxt(), "..", &mut app).0;
span_lint_and_sugg(
cx,
BORROW_AS_PTR,
expr.span,
"borrow as raw pointer",
"try",
format!("{}::ptr::{}!({})", core_or_std, macro_name, snip),
Applicability::MachineApplicable,
);
}
}
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