59 lines
1.8 KiB
Rust
59 lines
1.8 KiB
Rust
//! checks for `#[inline]` on trait methods without bodies
|
|
|
|
use crate::utils::span_lint_and_then;
|
|
use crate::utils::sugg::DiagnosticBuilderExt;
|
|
use rustc_ast::ast::Attribute;
|
|
use rustc_errors::Applicability;
|
|
use rustc_hir::{TraitFn, TraitItem, TraitItemKind};
|
|
use rustc_lint::{LateContext, LateLintPass};
|
|
use rustc_session::{declare_lint_pass, declare_tool_lint};
|
|
use rustc_span::{sym, Symbol};
|
|
|
|
declare_clippy_lint! {
|
|
/// **What it does:** Checks for `#[inline]` on trait methods without bodies
|
|
///
|
|
/// **Why is this bad?** Only implementations of trait methods may be inlined.
|
|
/// The inline attribute is ignored for trait methods without bodies.
|
|
///
|
|
/// **Known problems:** None.
|
|
///
|
|
/// **Example:**
|
|
/// ```rust
|
|
/// trait Animal {
|
|
/// #[inline]
|
|
/// fn name(&self) -> &'static str;
|
|
/// }
|
|
/// ```
|
|
pub INLINE_FN_WITHOUT_BODY,
|
|
correctness,
|
|
"use of `#[inline]` on trait methods without bodies"
|
|
}
|
|
|
|
declare_lint_pass!(InlineFnWithoutBody => [INLINE_FN_WITHOUT_BODY]);
|
|
|
|
impl<'tcx> LateLintPass<'tcx> for InlineFnWithoutBody {
|
|
fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
|
|
if let TraitItemKind::Fn(_, TraitFn::Required(_)) = item.kind {
|
|
check_attrs(cx, item.ident.name, &item.attrs);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn check_attrs(cx: &LateContext<'_>, name: Symbol, attrs: &[Attribute]) {
|
|
for attr in attrs {
|
|
if !attr.has_name(sym::inline) {
|
|
continue;
|
|
}
|
|
|
|
span_lint_and_then(
|
|
cx,
|
|
INLINE_FN_WITHOUT_BODY,
|
|
attr.span,
|
|
&format!("use of `#[inline]` on trait method `{}` which has no body", name),
|
|
|diag| {
|
|
diag.suggest_remove_item(cx, attr.span, "remove", Applicability::MachineApplicable);
|
|
},
|
|
);
|
|
}
|
|
}
|