Record cranelift pass timings in self profile results

Author: bjorn3

src/base.rs

@@ -182,6 +182,27 @@ pub(crate) fn compile_fn(
     cx.profiler.generic_activity("define function").run(|| {
         context.want_disasm = cx.should_write_ir;
         module.define_function(codegened_func.func_id, context).unwrap();
+
+        if cx.profiler.enabled() {
+            let mut recording_args = false;
+            cx.profiler
+                .generic_activity_with_arg_recorder(
+                    "define function (clif pass timings)",
+                    |recorder| {
+                        let pass_times = cranelift_codegen::timing::take_current();
+                        // Replace newlines with | as measureme doesn't allow control characters like
+                        // newlines inside strings.
+                        recorder.record_arg(format!("{}", pass_times).replace("\n", " | "));
+                        recording_args = true;
+                    },
+                )
+                .run(|| {
+                    if recording_args {
+                        // Wait a tiny bit to ensure chrome's profiler doesn't hide the event
+                        std::thread::sleep(std::time::Duration::from_nanos(2))
+                    }
+                });
+        }
     });
 
     if cx.should_write_ir {