1 files changed, 35 insertions, 0 deletions
diff --git a/compiler/rustc_span/src/profiling.rs b/compiler/rustc_span/src/profiling.rs
new file mode 100644
index 000000000..f169007fa
--- /dev/null
+++ b/compiler/rustc_span/src/profiling.rs
@@ -0,0 +1,35 @@
+use std::borrow::Borrow;
+
+use rustc_data_structures::profiling::EventArgRecorder;
+
+/// Extension trait for self-profiling purposes: allows to record spans within a generic activity's
+/// event arguments.
+pub trait SpannedEventArgRecorder {
+    /// Records the following event arguments within the current generic activity being profiled:
+    /// - the provided `event_arg`
+    /// - a string representation of the provided `span`
+    ///
+    /// Note: when self-profiling with costly event arguments, at least one argument
+    /// needs to be recorded. A panic will be triggered if that doesn't happen.
+    fn record_arg_with_span<A>(&mut self, event_arg: A, span: crate::Span)
+    where
+        A: Borrow<str> + Into<String>;
+}
+
+impl SpannedEventArgRecorder for EventArgRecorder<'_> {
+    fn record_arg_with_span<A>(&mut self, event_arg: A, span: crate::Span)
+    where
+        A: Borrow<str> + Into<String>,
+    {
+        self.record_arg(event_arg);
+
+        let span_arg = crate::with_session_globals(|session_globals| {
+            if let Some(source_map) = &*session_globals.source_map.borrow() {
+                source_map.span_to_embeddable_string(span)
+            } else {
+                format!("{:?}", span)
+            }
+        });
+        self.record_arg(span_arg);
+    }
+}