[debugger] Basic scope functionality and exception events in wrapper

test/mjsunit/harmony/async-debug-caught-exception.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: --allow-natives-syntax --harmony-async-await --expose-debug-as debug
-
-Debug = debug.Debug
-
-var exception = null;
-var log;
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Exception) return;
-  try {
-    var line = exec_state.frame(0).sourceLineText();
-    var match = /Exception (\w)/.exec(line);
-    assertNotNull(match);
-    log.push(match[1]);
-  } catch (e) {
-    exception = e;
-  }
-}
-
-async function thrower() {
-  throw "a";  // Exception a
-}
-
-async function caught_throw() {
-  try {
-    await thrower();
-  } catch (e) {
-    assertEquals("a", e);
-  }
-}
-
-
-// Caught throw, events on any exception.
-log = [];
-Debug.setListener(listener);
-Debug.setBreakOnException();
-caught_throw();
-%RunMicrotasks();
-Debug.setListener(null);
-Debug.clearBreakOnException();
-assertEquals(["a"], log);
-assertNull(exception);
-
-// Caught throw, events on uncaught exception.
-log = [];
-Debug.setListener(listener);
-Debug.setBreakOnUncaughtException();
-caught_throw();
-%RunMicrotasks();
-Debug.setListener(null);
-Debug.clearBreakOnUncaughtException();
-assertEquals([], log);
-assertNull(exception);
-
-var reject = Promise.reject("b");
-
-async function caught_reject() {
-  try {
-    await reject;
-  } catch (e) {
-    assertEquals("b", e);
-  }
-}
-
-// Caught reject, events on any exception.
-log = [];
-Debug.setListener(listener);
-Debug.setBreakOnException();
-caught_reject();
-%RunMicrotasks();
-Debug.setListener(null);
-Debug.clearBreakOnException();
-assertEquals([], log);
-assertNull(exception);
-
-// Caught reject, events on uncaught exception.
-log = [];
-Debug.setListener(listener);
-Debug.setBreakOnUncaughtException();
-caught_reject();
-%RunMicrotasks();
-Debug.setListener(null);
-Debug.clearBreakOnUncaughtException();
-assertEquals([], log);
-assertNull(exception);
-
-log = [];
-Debug.setListener(listener);
-Debug.setBreakOnException();
-
-// "rethrown" uncaught exceptions in return don't cause another event
-async function propagate_inner() { return thrower(); }
-async function propagate_outer() { return propagate_inner(); }
-
-propagate_outer();
-%RunMicrotasks();
-assertEquals(["a"], log);
-assertNull(exception);
-
-// Also don't propagate if an await interceded
-log = [];
-async function propagate_await() { await 1; return thrower(); }
-async function propagate_await_outer() { return propagate_await(); }
-propagate_await_outer();
-%RunMicrotasks();
-assertEquals(["a"], log);
-assertNull(exception);
-
-Debug.clearBreakOnException();
-Debug.setBreakOnUncaughtException();
-
-log = [];
-Promise.resolve().then(() => Promise.reject()).catch(() => log.push("d")); // Exception c
-%RunMicrotasks();
-assertEquals(["d"], log);
-assertNull(exception);
-
-Debug.clearBreakOnUncaughtException();
-Debug.setListener(null);
-
-// If devtools is turned on in the middle, then catch prediction
-// could be wrong (here, it mispredicts the exception as caught),
-// but shouldn't crash.
-
-log = [];
-
-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();
-});
-
-assertEquals([], log);