[debugger] Stepping and break-related functions in wrapper

test/mjsunit/harmony/debug-async-function-async-task-event.js

-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --harmony-async-await --expose-debug-as debug --allow-natives-syntax
-
-// The test observes the callbacks that async/await makes to the inspector
-// to make accurate stack traces. The pattern is based on saving a stack once
-// with enqueueRecurring and restoring it multiple times.
-
-// Additionally, the limited number of events is an indirect indication that
-// we are not doing extra Promise processing that could be associated with memory
-// leaks (v8:5380). In particular, no stacks are saved and restored for extra
-// Promise handling on throwaway Promises.
-
-// TODO(littledan): Write a test that demonstrates that the memory leak in
-// the exception case is fixed.
-
-Debug = debug.Debug;
-
-var base_id = -1;
-var exception = null;
-var expected = [
-  'enqueueRecurring #1',
-  'willHandle #1',
-  'then #1',
-  'didHandle #1',
-  'willHandle #1',
-  'then #2',
-  'cancel #1',
-  'didHandle #1',
-];
-
-function assertLog(msg) {
-  print(msg);
-  assertTrue(expected.length > 0);
-  assertEquals(expected.shift(), msg);
-  if (!expected.length) {
-    Debug.setListener(null);
-  }
-}
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.AsyncTaskEvent) return;
-  try {
-    if ("Promise.resolve" == event_data.name()) return;
-    if (base_id < 0)
-      base_id = event_data.id();
-    var id = event_data.id() - base_id + 1;
-    assertTrue("async function" == event_data.name());
-    assertLog(event_data.type() + " #" + id);
-  } catch (e) {
-    print(e + e.stack)
-    exception = e;
-  }
-}
-
-Debug.setListener(listener);
-
-var resolver;
-var p = new Promise(function(resolve, reject) {
-  resolver = resolve;
-});
-
-async function main() {
-  await p;
-  assertLog("then #1");
-  await undefined;
-  assertLog("then #2");
-}
-main();
-resolver();
-
-%RunMicrotasks();
-
-assertNull(exception);
-
-Debug.clearBreakOnUncaughtException();
-Debug.setListener(null);
-
-var resolve;
-var turnOnListenerPromise = new Promise(r => resolve = r);
-async function confused() {
-  await turnOnListenerPromise;
-  throw foo
-}
-
-confused();
-
-Promise.resolve().then(() => {
-  Debug.setListener(listener);
-  Debug.setBreakOnUncaughtException();
-  resolve();
-});
-
-%RunMicrotasks();
-assertNull(exception);