Automagically change the meaning of 'next' to 'async-next' when paused at an async function at awai…

runtime/observatory/tests/service/smart_next_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// VMOptions=--error_on_bad_type --error_on_bad_override
+
+import 'package:observatory/service_io.dart';
+import 'test_helper.dart';
+import 'dart:async';
+import 'dart:developer';
+
+foo() async { }
+bar() { }
+
+doAsync(stop) async {
+  if (stop) debugger();
+  await foo(); // Line 16.
+  bar();       // Line 17.
+  bar();       // Line 18.
+  await foo(); // Line 19.
+  await foo(); // Line 20.
+  bar();       // Line 21.
+  return null;
+}
+
+testMain() {
+  // With two runs of doAsync floating around, async step should only cause
+  // us to stop in the run we started in.
+  doAsync(false);
+  doAsync(true);
+}
+
+stepOverAwaitingResume(Isolate isolate) async {
+  Completer completer = new Completer();
+  await isolate.vm.getEventStream(VM.kDebugStream).then((stream) {
+    var subscription;
+    subscription = stream.listen((ServiceEvent event) {
+      if (event.kind == ServiceEvent.kResume) {
+        subscription.cancel();
+        completer.complete();
+      }
+    });
+  });
+  isolate.stepOver();
+  return completer.future;
+}
+
+smartNext(Isolate isolate) async {
+  if (isolate.pauseEvent.atAsyncJump) {
+    print("next-async");
+    return isolate.asyncStepOver()[Isolate.kSecondResume];
+  } else {
+    print("next-sync");
+    return stepOverAwaitingResume(isolate);
+  }
+}
+
+var tests = [
+             hasStoppedAtBreakpoint, stoppedAtLine(16), // foo()
+  smartNext, hasStoppedAtBreakpoint, stoppedAtLine(16), // await
+  smartNext, hasStoppedAtBreakpoint, stoppedAtLine(17), // bar()
+  smartNext, hasStoppedAtBreakpoint, stoppedAtLine(18), // bar()
+  smartNext, hasStoppedAtBreakpoint, stoppedAtLine(19), // foo()
+  smartNext, hasStoppedAtBreakpoint, stoppedAtLine(19), // await
+  smartNext, hasStoppedAtBreakpoint, stoppedAtLine(20), // foo()
+  smartNext, hasStoppedAtBreakpoint, stoppedAtLine(20), // await
+  smartNext, hasStoppedAtBreakpoint, stoppedAtLine(21), // bar()
+  resumeIsolate,
+];
+
+main(args) => runIsolateTests(args, tests, testeeConcurrent: testMain);