Merge pull request #13657 from jdonszelmann/disallowed-macros-to-early

collect attribute spans early for disallowed macros

clippy_lints/src/utils/attr_collector.rs

@@ -0,0 +1,40 @@
+use std::mem;
+use std::sync::OnceLock;
+
+use rustc_ast::{Attribute, Crate};
+use rustc_data_structures::sync::Lrc;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_session::impl_lint_pass;
+use rustc_span::Span;
+
+#[derive(Clone, Default)]
+pub struct AttrStorage(pub Lrc<OnceLock<Vec<Span>>>);
+
+pub struct AttrCollector {
+    storage: AttrStorage,
+    attrs: Vec<Span>,
+}
+
+impl AttrCollector {
+    pub fn new(storage: AttrStorage) -> Self {
+        Self {
+            storage,
+            attrs: Vec::new(),
+        }
+    }
+}
+
+impl_lint_pass!(AttrCollector => []);
+
+impl EarlyLintPass for AttrCollector {
+    fn check_attribute(&mut self, _cx: &EarlyContext<'_>, attr: &Attribute) {
+        self.attrs.push(attr.span);
+    }
+
+    fn check_crate_post(&mut self, _: &EarlyContext<'_>, _: &Crate) {
+        self.storage
+            .0
+            .set(mem::take(&mut self.attrs))
+            .expect("should only be called once");
+    }
+}

clippy_lints/src/utils/mod.rs

@@ -1,5 +1,7 @@
+pub mod attr_collector;
 pub mod author;
 pub mod dump_hir;
 pub mod format_args_collector;
+
 #[cfg(feature = "internal")]
 pub mod internal_lints;