49 lines
1.5 KiB
Rust
49 lines
1.5 KiB
Rust
use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::paths;
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use clippy_utils::source::snippet_with_macro_callsite;
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use clippy_utils::ty::{is_type_diagnostic_item, match_type};
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use rustc_errors::Applicability;
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use rustc_hir as hir;
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use rustc_lint::LateContext;
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use rustc_middle::ty;
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use rustc_span::symbol::{sym, Symbol};
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use super::CLONE_ON_REF_PTR;
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pub(super) fn check(
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cx: &LateContext<'_>,
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expr: &hir::Expr<'_>,
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method_name: Symbol,
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receiver: &hir::Expr<'_>,
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args: &[hir::Expr<'_>],
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) {
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if !(args.is_empty() && method_name == sym::clone) {
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return;
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}
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let obj_ty = cx.typeck_results().expr_ty(receiver).peel_refs();
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if let ty::Adt(_, subst) = obj_ty.kind() {
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let caller_type = if is_type_diagnostic_item(cx, obj_ty, sym::Rc) {
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"Rc"
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} else if is_type_diagnostic_item(cx, obj_ty, sym::Arc) {
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"Arc"
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} else if match_type(cx, obj_ty, &paths::WEAK_RC) || match_type(cx, obj_ty, &paths::WEAK_ARC) {
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"Weak"
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} else {
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return;
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};
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let snippet = snippet_with_macro_callsite(cx, receiver.span, "..");
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span_lint_and_sugg(
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cx,
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CLONE_ON_REF_PTR,
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expr.span,
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"using `.clone()` on a ref-counted pointer",
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"try this",
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format!("{caller_type}::<{}>::clone(&{snippet})", subst.type_at(0)),
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Applicability::Unspecified, // Sometimes unnecessary ::<_> after Rc/Arc/Weak
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);
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}
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}
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