1 files changed, 9 insertions, 6 deletions
diff --git a/src/librustc_session/utils.rs b/src/librustc_session/utils.rs
index 298727d07e4..7806f5e8753 100644
--- a/src/librustc_session/utils.rs
+++ b/src/librustc_session/utils.rs
@@ -1,10 +1,13 @@
-// Hack up our own formatting for the duration to make it easier for scripts
-// to parse (always use the same number of decimal places and the same unit).
-pub fn duration_to_secs_str(dur: std::time::Duration) -> String {
-    const NANOS_PER_SEC: f64 = 1_000_000_000.0;
-    let secs = dur.as_secs() as f64 + dur.subsec_nanos() as f64 / NANOS_PER_SEC;
+use crate::session::Session;
+use rustc_data_structures::profiling::VerboseTimingGuard;
 
-    format!("{:.3}", secs)
+impl Session {
+    pub fn timer<'a>(&'a self, what: &'a str) -> VerboseTimingGuard<'a> {
+        self.prof.sparse_pass(what)
+    }
+    pub fn time<R>(&self, what: &str, f: impl FnOnce() -> R) -> R {
+        self.prof.sparse_pass(what).run(f)
+    }
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, RustcEncodable, RustcDecodable)]