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 / paused / removed
+// machinery triggered by the step OverAwait command.
+asyncWithoutAwait() async {
+  debugger();
+  print('a');
+  await new Future.delayed(new Duration(seconds: 2));
+  print('b');
+  debugger();
+  debugger();
+}
+
+testMain() {
+  asyncWithoutAwait();
+}
+
+Breakpoint syntheticBreakpoint;
+
+Future<Isolate> testLowLevelAwaitOver(
+    Isolate isolate) {
+  assert(isolate.pauseEvent.atAsyncSuspension);
+
+  int state = 0;
+  bool firstResume = true;
+  handleBreakpointAdded(ServiceEvent event) {
+    expect(syntheticBreakpoint, isNull);
+    expect(state, 0);
+    if (!event.breakpoint.isSyntheticAsyncContinuation) {
+      // Not a synthetic async breakpoint.
+      return;
+    }
+    if (event.owner != isolate) {
+      // Wrong isolate.
+      return;
+    }
+    syntheticBreakpoint = event.breakpoint;
+    print('!!!! Synthetic async breakpoint added ${syntheticBreakpoint}');
+    state = 1;
+  }
+
+  handleResume(ServiceEvent event) {
+    if (firstResume) {
+      expect(state, 1);
+      if (event.owner != isolate) {
+        // Wrong isolate.
+        return;
+      }
+      print('!!!! Got first resume.');
+      state = 2;
+      firstResume = false;
+    } else {
+      expect(state, 3);
+      if (event.owner != isolate) {
+        // Wrong isolate.
+        return;
+      }
+      print('!!!! Got second resume.');
+      state = 4;
+    }
+
+  }
+
+  handlePauseBreakpoint(ServiceEvent event) {
+    expect(syntheticBreakpoint, isNotNull);
+    expect(state, 2);
+    if (!event.breakpoint.isSyntheticAsyncContinuation) {
+      // Not a synthetic async breakpoint.
+      return;
+    }
+    if (event.owner != isolate) {
+      // Wrong isolate.
+      return;
+    }
+    expect(event.breakpoint, equals(syntheticBreakpoint));
+    print('!!!! Paused at synthetic async breakpoint ${syntheticBreakpoint}');
+    state = 3;
+  }
+
+  handleBreakpointRemoved(ServiceEvent event) {
+    expect(syntheticBreakpoint, isNotNull);
+    expect(state, 4);
+    if (!event.breakpoint.isSyntheticAsyncContinuation) {
+      // Not a synthetic async breakpoint.
+      return;
+    }
+    if (event.owner != isolate) {
+      // Wrong isolate.
+      return;
+    }
+    expect(event.breakpoint, equals(syntheticBreakpoint));
+    print('!!!! Synthetic async breakpoint removed ${syntheticBreakpoint}');
+    state = 5;
+    syntheticBreakpoint = null;
+  }
+
+  // Set up a listener to wait for debugger events.
+  Completer completer = new Completer();
+  isolate.vm.getEventStream(VM.kDebugStream).then((stream) {
+    var subscription;
+    subscription = stream.listen((ServiceEvent event) async {
+      if (event.kind == ServiceEvent.kBreakpointAdded) {
+        handleBreakpointAdded(event);
+        expect(state, 1);
+      } else if (event.kind == ServiceEvent.kResume) {
+        if (firstResume) {
+          handleResume(event);
+          expect(state, 2);
+        } else {
+          handleResume(event);
+          expect(state, 4);
+        }
+      } else if (event.kind == ServiceEvent.kPauseBreakpoint) {
+        handlePauseBreakpoint(event);
+        expect(state, 3);
+        // Check that we are paused after the await statement.
+        await (stoppedAtLine(20)(isolate));
+        // Resume the isolate so that we trigger the breakpoint removal.
+        print('!!!! Triggering synthetic breakpoint removal.');
+        isolate.resume();
+      } else if (event.kind == ServiceEvent.kBreakpointRemoved) {
+        handleBreakpointRemoved(event);
+        expect(state, 5);
+        subscription.cancel();
+        if (completer != null) {
+          // Reload to update isolate.pauseEvent.
+          completer.complete(isolate.reload());
+          completer = null;
+        }
+      }
+    });
+  });
+
+  isolate.stepOverAsyncSuspension();
+
+  return completer.future;  // Will complete when breakpoint added.
+}
+
+
+var tests = [
+  hasStoppedAtBreakpoint,
+  stoppedAtLine(18),
+  stepOver,
+  stepOver,
+  stepOver,
+  (Isolate isolate) async {
+    expect(isolate.pauseEvent.atAsyncSuspension, isTrue);
+    expect(syntheticBreakpoint, isNull);
+  },
+  testLowLevelAwaitOver,
+  hasStoppedAtBreakpoint,
+  stoppedAtLine(22),
+  resumeIsolate,
+  hasStoppedAtBreakpoint,
+  stoppedAtLine(23),
+  resumeIsolate,
+];
+
+main(args) => runIsolateTests(args, tests, testeeConcurrent: testMain);