Add step OverAwait to service protocol

runtime/observatory/tests/service/step_over_await_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  --verbose_debug --trace_service
+
+import 'dart:async';
+import 'dart:developer';
+
+import 'test_helper.dart';
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+
+// This tests the low level synthetic breakpoint added / removed machinery
+// triggered by the step OverAwait command.
+asyncWithoutAwait() async {
+  debugger();
+  await new Future.delayed(new Duration(seconds: 2));
+  debugger();
+}
+
+testMain() {
+  asyncWithoutAwait();  // Line 22
+}
+
+Future<Isolate> stepOverAwaitAndWaitForAddedSyntheticBreakpoint(
+    Isolate isolate) {
+  assert(isolate.pauseEvent.atAwait);
+
+  // Set up a listener to wait for breakpoint events.
+  Completer completer = new Completer();
+  isolate.vm.getEventStream(VM.kDebugStream).then((stream) {
+    var subscription;
+    subscription = stream.listen((ServiceEvent event) {
+        if (event.kind == ServiceEvent.kBreakpointAdded) {

[rmacnak, 2016/02/16 21:21:58]

over-idented

[Cutch, 2016/02/17 18:24:21]

Done.

+          if (!event.breakpoint.isSyntheticAsync) {
+            return;
+          }
+          print('Synthetic async breakpoint added ${event.breakpoint}');
+          subscription.cancel();
+          if (completer != null) {
+            // Reload to update isolate.pauseEvent.
+            completer.complete(isolate.reload());
+            completer = null;
+          }
+        }
+    });
+  });
+
+  isolate.stepOverAwait();
+
+  return completer.future;  // Will complete when breakpoint added.
+}
+
+Future<Isolate> waitForRemovedSyntheticBreakpoint(Isolate isolate) {
+  Completer completer = new Completer();
+  isolate.vm.getEventStream(VM.kDebugStream).then((stream) {
+    var subscription;
+    subscription = stream.listen((ServiceEvent event) {
+        if (event.kind == ServiceEvent.kBreakpointRemoved) {

[rmacnak, 2016/02/16 21:21:58]

over-idented

[Cutch, 2016/02/17 18:24:21]

Done.

+          if (!event.breakpoint.isSyntheticAsync) {
+            return;
+          }
+          print('Synthetic async breakpoint removed ${event.breakpoint}');
+          subscription.cancel();
+          if (completer != null) {
+            // Reload to update isolate.pauseEvent.
+            completer.complete(isolate.reload());
+            completer = null;
+          }
+        }
+    });
+  });
+
+  return completer.future;  // Will complete when breakpoint removed.
+}
+
+var tests = [
+  hasStoppedAtBreakpoint,
+  stoppedAtLine(18),
+  (Isolate isolate) {
+    expect(isolate.pauseEvent.atAwait, isTrue);

[rmacnak, 2016/02/16 21:21:58]

Something's not right. There're at least two constructor calls to step over
between the debugger call and the await.

+  },
+  stepOverAwaitAndWaitForAddedSyntheticBreakpoint,
+  waitForRemovedSyntheticBreakpoint,
+  hasStoppedAtBreakpoint,
+  stoppedAtLine(19),
+];
+
+main(args) => runIsolateTests(args, tests, testeeConcurrent: testMain);