Add infrastructure for emitting timing sections

compiler/rustc_errors/src/lib.rs

@@ -74,7 +74,9 @@ pub use snippet::Style;
 pub use termcolor::{Color, ColorSpec, WriteColor};
 use tracing::debug;
 
+use crate::emitter::TimingEvent;
 use crate::registry::Registry;
+use crate::timings::TimingRecord;
 
 pub mod annotate_snippet_emitter_writer;
 pub mod codes;
@@ -90,6 +92,7 @@ mod snippet;
 mod styled_buffer;
 #[cfg(test)]
 mod tests;
+pub mod timings;
 pub mod translation;
 
 pub type PResult<'a, T> = Result<T, Diag<'a>>;
@@ -1156,6 +1159,14 @@ impl<'a> DiagCtxtHandle<'a> {
         self.inner.borrow_mut().emitter.emit_artifact_notification(path, artifact_type);
     }
 
+    pub fn emit_timing_section_start(&self, record: TimingRecord) {
+        self.inner.borrow_mut().emitter.emit_timing_section(record, TimingEvent::Start);
+    }
+
+    pub fn emit_timing_section_end(&self, record: TimingRecord) {
+        self.inner.borrow_mut().emitter.emit_timing_section(record, TimingEvent::End);
+    }
+
     pub fn emit_future_breakage_report(&self) {
         let inner = &mut *self.inner.borrow_mut();
         let diags = std::mem::take(&mut inner.future_breakage_diagnostics);